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Electric Mail Trucks | Earth Wise

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The US Postal Service recently announced that it plans to buy at least 66,000 electric vehicles by 2028.  With more than 231,000 total vehicles, the Postal Services operates one of the largest civilian vehicle fleets in the world.

Last February, the Postal Service announced a plan to replace up to 165,000 older mail trucks, many of which are as much as 30 years old.  The gas-powered trucks get an estimated 8.6 miles per gallon when air conditioning is running.  The plan was for only 10% of the new trucks to be electric, citing the high upfront costs of electric vehicles even though they generally make up the difference by saving on fuel and maintenance costs over time. 

Facing strong criticism from the Biden administration, the Postal Service shifted course and in July announced that 40% of the new trucks would be electric. With passage of the Inflation Reduction Act in August, the Postal Service received $3 billion for fleet electrification and has once again changed its plans.  It also announced that it intends to stop buying gas-powered delivery trucks altogether after 2026.

As part of the new plan, the Postal Service plans to upgrade hundreds of facilities across the country to accommodate electric vehicles.  This will include installing chargers and streamlining delivery operations to reduce unnecessary trips.

The Postal Service is no alone in working to clean up its fleets.  FedEx says it plans to completely electrify its pickup and delivery fleet by 2040.  Amazon has ordered 100,000 electric vans from the start-up company Rivian.

Electrifying the postal delivery system makes abundant sense.  Postal routes are predictable and there is ample charging time to meet the power needs of the fleet.

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Your Mail Truck Is Going Electric

Photo, posted January 18, 2017, courtesy of Rusty Clark via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Carbon Capture In Wyoming | Earth Wise

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Wyoming produces about 40% of our country’s coal and many towns in the state were built because of and make their living from it.  With coal’s plummeting share in the nation’s electricity, there is a great deal of anxiety among residents of those towns.

As carbon dioxide levels in the atmosphere continue to climb, there is a growing sense that cutting emissions will not happen quickly enough and it will be necessary to pull the greenhouse gas out of the atmosphere.  The current long-term government climate strategy assumes that carbon removal will account for 6 to 8 percent of the nation’s greenhouse gas reductions by 2050.

The Inflation Reduction Act passed in August provides $3.5 billion to help build “direct air capture hubs” around the country, with an emphasis on fossil fuel-dependent communities such as many in Wyoming. 

The town of Rock Springs, Wyoming is home to the Jim Bridger Coal Plant. A company called CarbonCapture, Inc., is launching Project Bison, which will build a direct air capture facility outside of town that is set to begin operations next year.  It will initially capture 10,000 metric tons of CO2 per year but plans to expand that to 5 million tons a year by 2030. 

That would be far more than any current carbon capture plant can do. The largest plant in the world, located in Iceland, pulls in only about 4,000 metric tons a year.

There are many problems associated with carbon capture.  It uses up very large amounts of energy, possibly presents environmental problems, and is very expensive.  In short, the technology has a long way to go before becoming viable.  However, this may ultimately be another example where necessity is the mother of invention.

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Carbon Removal Is Coming to Fossil Fuel Country. Can It Bring Jobs and Climate Action?

Photo, posted July 22, 2012, courtesy of Max Phillips via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Fusion Power And The Climate Crisis | Earth Wise

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In December, the Department of Energy announced that scientists at Lawrence Livermore National Laboratory in California had achieved a breakthrough in nuclear fusion technology.  Fusion is the process by which the sun generates energy.  If we had the means to produce nuclear fusion in a controlled fashion, it would be an almost limitless source of clean energy.

Scientists have been trying to develop controllable fusion since the advent of the hydrogen bomb in the 1950s.  H-Bombs are basically uncontrollable fusion.

There are massive experiments under development around the work seeking the means to create and control fusion.  There are multi-billion-dollar projects such as the ITER tokamak project in southern France, that have been ongoing for decades.  Colossal equipment is required to produce the temperatures of millions of degrees needed to fuse hydrogen atoms into helium atoms.

The Livermore project uses 192 powerful laser beams to vaporize a tiny pellet and provide the energy required to initiate fusion. The breakthrough is that the experiment released more energy than the lasers put in.  This was the first time a fusion experiment produced a net gain of energy.

Is fusion the solution to de-carbonizing the energy system?  Perhaps someday it might be.  However, even the most optimistic fusion researchers believe it will be at least another decade before even the experimental fusion systems around the world can reliably produce energy and the efforts will cost untold billions of dollars. 

The world cannot wait for fusion power to save the day.  The focus must remain on currently available renewable energy technologies if we are to achieve the necessary emission reductions in time to prevent the worst effects of climate change.

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Can Fusion Solve the Climate Crisis?

Photo, posted July 29, 2010, courtesy of Steve Jurvetson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Electric Cars And Cleaner Air | Earth Wise

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Cities are awash in microscopic soot and other pollutants from the tailpipes of vehicles.  Apart from contributing substantially to the warming of the planet, these emissions have a significant impact on human health.  Research at Cornell University has determined that the continued growth of electric cars will lead to cleaner air and reduced human mortality in most if not all U.S. metropolitan areas.

The study, published in Renewable and Sustainable Energy Reviews, estimated the health impact and consequential economic impact of cleaner air in American cities as a result of the transition to electric vehicles.

For example, by 2050, Los Angeles will have 1,163 fewer premature deaths annually, corresponding to $12.6 billion in economic health benefits.  Greater New York City could see 574 fewer deaths a year leading to $6.24 billion in associated economic gains.

Global sales of electric cars have grown steadily.  In 2016, they accounted for less than 1% of the market.  That share grew to 2.2% in 2018, 4.1% in 2020, and 6.6% in 2021.

In the U.S., electric cars accounted for 4.5% of sales in 2021, but in many cities, the numbers were much higher. 

These trends are likely to accelerate as a combination of government policies and major decisions by automakers drive a rapid transition to electrification.  While mitigating the effects of climate change continues to be the main driving force for that transition, the human health benefits will be a very significant reward for doing the right thing for the planet.

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Electric car sales drive toward cleaner air, less mortality

Photo, posted May 11, 2021, courtesy of Chris Yarzab via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Renewables Will Overtake Coal | Earth Wise

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According to a recent report by the International Energy Agency, worldwide growth in renewable power capacity is set to double in the next five years.  In fact, by 2027, the world will add as much renewable power as it did over the previous 20 years.

Of particular significance is that renewables are going to overtake coal as the largest source of electricity generation by early 2025.

The global energy crisis triggered by the war in Ukraine has had multiple effects on the evolution of the energy system.  While the war has driven a resurgence in fossil fuel consumption in Europe in order to replace gas from Russia, that resurgence is expected to be short-lived.  Instead, the current energy crisis may turn out to be an historic turning point toward a cleaner and more secure energy system.

Soaring fossil-fuel prices triggered by the war have caused many countries to respond by embracing wind turbines, solar panels, nuclear power plants, hydrogen fuels, electric vehicles, and electric heat pumps.  In the US, Congress approved more than $370 billion in spending for clean energy technologies as part of the Inflation Reduction Act.  China, India, South Korea, and Japan have all increased their national targets for renewable power.   However, heating and cooling buildings with renewable power remains a sector needing larger improvement, according to the energy agency.

Overall, the expansion of renewable power over the next five years is now projected to happen much faster than what was projected just one year ago. The new IEA report revised last year’s forecast for renewables growth by 30% as a result of the introduction of new policies by many of the world’s largest greenhouse gas emitters.

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Renewables Will Overtake Coal by Early 2025, Energy Agency Says

Photo, posted March 8, 2021, courtesy of Stanze via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

California Offshore Wind Auction | Earth Wise

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In December, the Bureau of Ocean Energy Management held the first auction for offshore wind energy leases on the West Coast.  The BOEM lease sale offered five lease areas covering 373,268 acres off the central and northern California coast.  The leased areas have the potential to produce over 4.6 gigawatts of wind energy, which is enough to power 1.5 million homes.

The auction drew competitive bids from five companies totaling over $750 million.  The winning bidders were RWE Offshore Wind Holdings, California North Floating, Equinor Wind, Central California Offshore Wind, and Invenergy California Offshore. 

RWE is a German company with subsidiaries across the globe.  California North Floating is an affiliate of the Danish developer Copenhagen Infrastructure Partners.  Equinor Wind is a Norwegian company already heavily involved in offshore wind projects on the East Coast.  Central California Offshore Wind is managed by a joint venture between Spanish and French energy companies.   Invenergy is a privately held global developer and operator of renewable energy headquartered in Chicago.

The bidders will receive credits for participating in programs that support work force training programs for the floating offshore wind industry and/or the development of a US domestic supply chain for that industry. 

Offshore wind off the Pacific coast has enormous potential for enhancing the country’s energy future but represents a significant challenge because the deep ocean floors necessitate the use of floating wind technology as opposed to turbines that are affixed to the sea floor.

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Biden-Harris Administration Announces Winners of California Offshore Wind Energy Auction

Photo, posted December 30, 2013, courtesy of Derek Finch via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Mauna Loa Eruption And Climate Tracking | Earth Wise

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Mauna Loa, the largest active volcano in the world, erupted for the first time in nearly 40 years in late November.  A 124-foot aluminum tower at the top of the volcano has been the site of carbon dioxide measurements for over 60 years but the eruption cut off power to the site, stopping the monitoring.

Carbon dioxide measurements on Mauna Loa began in 1958.  The project was started by geochemist Charles Keeling and eventually taken over by his son Ralph Keeling upon his father’s death in 2005.  It is the longest continuous record of the rising levels of carbon dioxide in the world.

Mauna Loa is an ideal location for carbon dioxide monitoring because it is a remote location away from both carbon dioxide sources like dense population centers and roads, and carbon sinks like areas of heavy vegetation.

There are hundreds of carbon dioxide monitoring stations around the world, including more than 70 operated by the National Oceanic and Atmospheric Administration, so the interruption will not stop global recordkeeping.  But Mauna Loa holds significant symbolism as the first and most frequently sited source of carbon dioxide data.

There have been other interruptions in the measurements.  Federal budget cuts in 1964 paused them for about 3 months.  A 1984 eruption also cut off power to the facility and shut it down for about a month.

When the facility first started operating, the average carbon dioxide concentration was measured at 313 parts per million.   Most recently, levels have peaked at around 421 parts per million, the greatest concentration in at least 4 million years. 

Power will be restored to the Mauna Loa facility and its measurements will resume.

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Mauna Loa Eruption Threatens a Famous Climate Record

Photo, posted November 29, 2022, courtesy of L. Gallant / USGS via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Solar Parking Lots In France | Earth Wise

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France has passed legislation that will require all parking lots with more than 80 spaces to be covered over by solar panels.  This is part of a broader effort to put solar panels on vacant lots, empty land alongside roadways and train tracks, and even some farmland.  The overall program would add 11 gigawatts of solar power to the French electricity grid.

The legislation applies to both new and existing parking lots.  Owners of parking lots with more than 400 spaces would have 3 years to comply, while owners of lots with 80 to 400 spaces would have five years.

To produce 11 gigawatts of solar output, about half a percent of France’s urban land would need to be covered with solar panels.  This is quite a bit, but not an insurmountable obstacle.  Parking lots, however, could only provide a fraction of what is needed.  It would take something like 8 million parking spaces covered with solar panels to produce that much power.  That is probably at least twice as many as France has.

Several countries, most notably Germany, already have mandates for new construction to incorporate renewable energy.  This includes solar panels, biomass boilers, heat pumps, and wind turbines.  Many parking lots in southern Europe already have sunshades over them, which would make it pretty easy to install solar panels.  This is much rarer in cooler countries.

France is pursuing this policy to reduce its dependence on nuclear power, which currently provides 70% of the country’s electricity.  Apart from the general trend of opposition to nuclear power, reliance upon it during increasingly common droughts is problematic as the power plants require significant amounts of water to operate.

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France’s plan for solar panels on all car parks is just the start of an urban renewable revolution

Photo, posted February 11, 2008, courtesy of Armando Jimenez / U.S. Army Environmental Command via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Europe Is Warming Faster Than The Rest Of The Planet | Earth Wise

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A new study by researchers at Stockholm University has found that the warming during the summer months in Europe has been much faster than the global average.  The findings, published in the Journal of Geophysical Research Atmospheres, are that the climate across the European continent has become drier, particularly in southern Europe, leading to worse heat waves and an increased risk of fires.

Warming over land areas occurs much faster than over oceans.  The global average warming to date is 1.6 degrees Celsius over land and 0.9 degrees over oceans.   This means that the global emissions budget to keep warming below 1.5 degrees has already been used up over land.  The new study in fact shows that the emissions budget to avoid 2 degrees of warming has already been exceeded over large parts of Europe during the summer half-year (April to September).

This accelerated warming in Europe has led to more frequent heat waves.  These, in turn, increase the risk of fires, such as the devastating fires in southern Europe this past summer.

Southern Europe has been experiencing a positive feedback situation in which the ongoing warming has been amplified because of drier soil and decreased evaporation.  Added to that, there has been less cloud coverage over large parts of Europe, probably as a result of less water vapor in the air.

The study also looked at the impact of aerosol particles on temperatures in Europe.  As the amount of relatively short-lived aerosol particles has decreased with the reduction of coal-fired power plants, the temporary cooling effects of those particles partially masking the underlying warming trend have diminished.  In contrast, carbon dioxide emissions stay in the atmosphere for centuries.

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Large parts of Europe are warming twice as fast as the planet on average

Photo, posted April 18, 2020, courtesy of Roman Ranniew via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

A Green New Year | Earth Wise

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Every year, millions of people around the world make resolutions in hopes of sparking positive changes in the new year.  Popular resolutions include improving health and fitness, traveling more, spending less, and so on.  With the New Year just around the corner, here are seven resolutions we all could make that would collectively have a major impact on the planet: 

1) Eat less meat.  Resource-intensive animal-based foods like meat, dairy, and eggs are one of the chief contributors to climate change. 

2) Get a home energy audit.  It’s a great way to understand your home’s energy footprint and discover ways to improve the energy efficiency of your home. 

3) Buy local whenever possible.  Shopping locally supports the local economy and dramatically cuts down on the carbon emissions associated with shipping.

4) Carry reusable shopping bags on errands. While disposable shopping bags are convenient, they are difficult to recycle and are often thrown away. 

5) Air dry your laundry whenever possible.  Drying clothes outside or using an indoor drying rack can save money and energy.  Americans spend about $9 billion a year on electricity to dry clothing. 

6) Purchase used or pre-owned items.  The market for second-hand items is booming, making it possible to purchase pretty much anything you want at thrift stores or online. 

7) Bring a reusable water bottle everywhere.  According to the EPA, Americans throw away enough plastic bottles each year to circle the earth five times.  Carrying your own bottle helps reduce this waste and will save you money.

As we ring in the new year this weekend, let’s raise our glasses to a cleaner and greener 2023. 

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10 Sustainable New Year’s Resolutions!

New Year’s Resolutions

Photo, posted December 31, 2014, courtesy of Doug Anderson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

It Really Is Greenhouse Gases | Earth Wise

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The scientific consensus that human-generated carbon dioxide is changing the climate began to form in the 1980s. 

For a long time, the changes to the climate were simply denied.  After a while, as those changes became increasingly hard to ignore, the argument shifted to the changes being real but not caused by anything people are doing.  The multi-trillion-dollar fossil fuel industry was strongly motivated to focus attention away from the association between carbon dioxide and climate change.

The greenhouse gas effect has been known since the 19th century.  It isn’t just real; it is essential to life on earth.  Without sufficient levels of carbon dioxide in the atmosphere to trap some of the sun’s heat, the earth would be an ice planet incapable of supporting much in the way of life.  But there can be too much of a good thing.

Naysayers continue to grasp at alternative explanations for the warming planet rather than the inconvenient truth.  Some people try to claim that it is the release of heat from all our energy-generating activities -power plants, heaters and air conditioners, vehicles, and so on – that is warming the planet.

That issue has been studied in detail.  Human activity does generate a lot of heat and, technically speaking, that heat does help warm the planet.  However, the sun dumps 10,000 times more heat on the earth than all of human energy production added together.  Just the normal fluctuations in solar energy are 10 times larger than everything we do put together.

What is increasingly warming the planet is not the continuing energy striking the earth; it is primarily the fact that growing levels of greenhouse gases in the atmosphere are trapping more and more of that heat and preventing it from escaping into space.

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Integrating anthropogenic heat flux with global climate models

Photo, posted August 25, 2009, courtesy of Gerald Simmons via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Rainforest Promises | Earth Wise

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The recent UN climate summit in Sharm el Sheikh, Egypt brought with it lots of pledges for action.   Among them was a promise from the three countries that are home to more than half of the world’s tropical rainforests to try to do something to protect them.

The ministers of Brazil, Indonesia, and the Democratic Republic of Congo signed an agreement pledging cooperation on sustainable management and conservation, restoration of critical ecosystems, and creation of economies that would ensure the health of both their people and their forests.

The plan has no financial backing of its own.  The countries are pledging to work together to establish a funding mechanism that could help to preserve the tropical forests that both help regulate the Earth’s climate and sustain a wide range of animals, plants, birds, and insects.

That such an agreement has come about at all is a result of the election of Luiz Lula da Silva as Brazilian president, replacing Jair Bolsonaro, who was famously an opponent of any and all environmental conservation or protections.  President Lula addressed the attendees of the climate summit promising that “Brazil is back.”   He described his country as having been in a cocoon for the past four years under his predecessor.  He declared that going forward, Brazil will be a force to combat climate change.  Given the importance of the Amazon rainforest, that is critical for the success of the world’s efforts.

Like all other issues on the table at the climate summit, the real challenge is not to come up with meaningful pledges on climate action, it is to be able to follow through on those pledges.  If past summits are any indication, that is not an easy task.

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Brazil, Indonesia and Congo Sign Rainforest Protection Pact

Photo, posted September 15, 2013, courtesy of Moises Silva Lima via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Climate A Winner In The Elections | Earth Wise

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The dominant issues in midterm elections in November were the economy and abortion rights, but at the same time there were also ballot initiatives in various cities and states across the country related to climate.  What some describe as the ‘silent surprise’ of the election was that these initiatives generally passed and, in some cases, by large majorities.

The most significant of these ballot measures was in New York, where two-thirds  of voters passed the largest environmental bond measure in state history.  The measure funds up to $4.2 billion for environmental improvement projects including increasing flood resiliency, reducing greenhouse gas emissions, electrifying school buses, and creating more green and open spaces.

The Clean Water, Clean Air, and Green Jobs Environmental Bond Act provides up to $1.5 billion for projects aimed at climate change mitigation.  Another $1.1 billion is targeted for flood risk reduction and waterway restoration.  $650 million goes for water quality and infrastructure improvement. 

Rhode Island voters passed a green bonds act that will allow the state to invest in climate resiliency at the municipal level, as well as local recreation, open space protection, brownfields remediation, and forest and habitat restoration. 

Other climate-related ballot measures passed in Boulder, Colorado and in El Paso, Texas.  There were however a few climate measures that lost.  Proposition 30 in California that would have taxed very high-income residents to encourage sale of electric vehicles failed.  So did Arizona Proposition 310, which would have increased sales taxes by 0.1% to fund fire districts.

But overall, it was a good election for the climate.

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Voters pass historic climate initiatives in ‘silent surprise’ of US midterms

Photo, posted September 24, 2021, courtesy of Ivan Radic via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Are Companies Really Reducing Emissions? | Earth Wise

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Many companies around the world are declaring tremendous progress in reducing their greenhouse gas emissions.  Sometimes these claims are the result of actions that really do  reduce emissions but other times they are the result of something called “market-based accounting”. Businesses buy credits from clean energy providers that allows them to say they are running on green power when they actually are not.

The market analysis firm Bloomberg Green analyzed almost 6,000 climate reports filed by corporations last year and found that over 1,300 of them employed market-based accounting to erase over 120 million tons of emissions from their records.

Some clean energy contracts do have major climate benefits.  For example, companies like Amazon, Nestle, and Target have signed long-term power purchase agreements that ultimately help renewable developers finance new energy projects.

On the other hand, renewable energy credits are often short-term transactions with existing facilities and do little to stimulate investment or otherwise lead to greater use of green power.  They simply shift around ownership of existing renewable energy without doing anything new for the climate.

Some companies have made meaningful cuts to their pollution by putting solar panels on their roofs, upgrading their lighting and air conditioning equipment, and so on.  But many are reluctant to spend their capital in this way, even if it eventually saves money through lower electric bills.

Customers and shareholders want to see corporations do their part in reducing emissions.  But too many are making grandiose claims enabled by market-based accounting while doing far too little to help the environment.  Dubious claims of climate progress are not harmless; it is essential for the world’s companies to really do their share.

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What Really Happens When Emissions Vanish

Photo, posted July 16, 2014, courtesy of Mike Mozart via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Getting Rid Of Hydrogen Sulfide | Earth Wise

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Hydrogen sulfide gas produces the characteristic smell of rotten eggs, sewers, stockyards, and landfills.  The petroleum industry produces thousands of tons of the stuff each year as a byproduct of the processes that remove sulfur from petroleum, natural gas, coal, and other products.  The industry faces substantial fines for emitting hydrogen sulfide, but remediation is expensive.

Researchers at Rice University have developed a method for turning hydrogen sulfide into hydrogen gas and sulfur in a single step.  Called plasmonic photocatalysis, it not only gets rid of an undesirable substance, it does so by producing valuable byproducts.

The established way of getting rid of hydrogen sulfide is called the Claus process.  It requires multiple steps, including some that require combustion chambers heated to 1,500 degrees Fahrenheit.  The end product is sulfur and water.

The Rice University process gets all of its energy from light.  A surface of grains of silicon dioxide is dotted with tiny gold nanoparticles.  These particles interact strongly with a specific wavelength of visible light and cause plasmonic reactions that create short-lived, high-energy electrons that drive the catalysis of hydrogen sulfide.  Given that the process requires only visible light and no external heating, it should be relatively straightforward to scale up using solar energy or very efficient LED lamps.

The new hydrogen sulfide remediation technology has been licensed by a Houston-based startup company with more than 60 employees whose founders include some of the Rice researchers.  The process may end up being efficient enough and cheap enough for cleaning up non-industrial sources of hydrogen sulfide such as sewers and animal waste.

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New catalyst can turn smelly hydrogen sulfide into a cash cow

Photo, posted July 8, 2021, courtesy of Doug Letterman via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Lab-Grown Meat Is Legal | Earth Wise

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We’ve heard more and more about laboratory meat.  Other names for it are cultured meat, cultivated meat, or test tube meat.  Whatever name ends up sticking, the idea is to take living cells from animals and grow them in a controlled laboratory environment to produce a meat product that doesn’t involve the slaughter of any animals.  Supporters say cultured meat is more efficient and environmentally friendly than traditional livestock.  Livestock agriculture is one of the largest emitters of greenhouse gases, uses vast amounts of land, and consumes much of the world’s fresh water.

Years ago, we reported on a company called Memphis Meats, which was one of a number of companies developing techniques for harvesting cells from animal tissues and using them to grow edible flesh in bioreactors.

Recently, that company – now called Upside Foods – has become the first company to receive FDA approval declaring their meat product to be safe for human consumption.  The USDA still needs to give its approval and it may be a little while longer before Upside’s first chicken products will end up in supermarkets.  There are more than 150 cultivated meat companies around the world backed by billions of dollars in investments.  The FDA is in ongoing discussions with multiple firms in the business.

Upside Foods, based in the San Francisco Bay area, is planning to market chicken, beef meatballs, and duck in the near future.  Other companies are working on seafood products.  Up until now, Singapore has been the only country in which lab-grown meat products are legally sold to consumers.  With this landmark FDA ruling, that is all about to change.

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US declares lab-grown meat safe to eat in ‘groundbreaking’ move

Photo, posted April 15, 2008, courtesy of Andrew Otto via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Windows To Cool Buildings | Earth Wise

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About 15% of global energy consumption is for cooling buildings.  Because of this, there is an ever- growing need for technologies that can more efficiently cool buildings.   Researchers at Notre Dame University have used advanced computing technology and artificial intelligence to design a transparent window coating that is able to lower the temperature inside buildings without using any energy.

The idea is to create a coating that blocks the sun’s ultraviolet and near-infrared light, which are parts of the solar spectrum that otherwise pass through glass and help to heat an enclosed room.  Cooling needs can be reduced further if the coating can radiate heat from the surface of the window so it can pass through the atmosphere into space.  Designing a coating that does both of those things simultaneously while transmitting visible light is difficult.  Coatings should not interfere with the view out the window.

The Notre Dame researchers used advanced computer modeling to create a so-called transparent radiative cooler that meets these goals.  The coating consists of alternating layers of common materials like silicon dioxide, silicon nitride, and aluminum oxide or titanium dioxide on top of a glass base and topped with a film of polydimethylsiloxane.  The computing method was able to optimize this structure far faster and better than conventional design techniques.

The researchers say that in hot, dry cities, the coating could potentially reduce cooling energy consumption by 31% compared with conventional windows.  The same materials could be used in other applications, such as car and truck windows.  In addition, the quantum computing-enabled optimization method used for this work could be used to design other composite materials.

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Clear window coating could cool buildings without using energy

Photo, posted September 6, 2015, courtesy of Robert Otmn via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

New York Bans Some Crypto Mining | Earth Wise

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Crypto mining, the arcane process by which cryptocurrencies are generated, is incredibly energy-intensive.  As of this past summer, global electricity usage for the activity is as much as 240 billion kilowatt-hours per year, which is more than many entire countries use (for example Australia and Argentina.)  Crypto mining consumes as much electricity as all the conventional computer data centers in the world.

All that energy usage is problematic for the environment, but a growing practice has made it far worse.  Crypto miners have been re-powering decommissioned fossil fuel power plants to produce electricity strictly for mining operations.  Doing so eliminates the climate benefits achieved by shutting down those plants.

The New York State Legislature passed a bill in June that would place a two-year moratorium on permits to re-power fossil fuel plants.  It does not prevent crypto mining from existing generation sources.  The bill had sat on the governor’s desk until after the recent election.   But in late November, Governor Hochul signed the bill despite considerable lobbying against it.

The temporary ban was heavily opposed by cryptocurrency industry groups, to no surprise.  While some states actually offer tax incentives to lure crypto mining operations, supporters of the legislation hope that New York’s action may cause others to follow its lead and stop the reactivation of old fossil fuel plants.

The two-year moratorium will allow time to properly evaluate the impact of the crypto mining industry on the state’s climate goals.  It is pretty obvious that reactivating old, retired fossil fuel power plants as an energy source is a move in the wrong direction.

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New York Enacts 2-Year Ban on Some Crypto-Mining Operations

Photo, posted February 27, 2021, courtesy of Ivan Radic via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Deforestation-Free Pledges | Earth Wise

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Deforestation is the purposeful clearing of forested land. Forests are cut down to make space for animal grazing, agriculture, and to obtain wood for fuel, manufacturing, and construction. Deforestation has greatly altered landscapes around the world and continues to do so today. 

Deforestation is the second largest contributor to global greenhouse gas emissions, trailing only fossil fuel use. Deforestation can lead to all sorts of problems, including biodiversity loss, soil erosion, desertification, and flooding.  Deforestation also threatens peoples’ livelihoods and increases inequality and conflict.

As a result, many companies around the world have made pledges to remove deforestation from their supply chains.  In fact, more than 94 companies had adopted zero-deforestation commitments by 2021.  But while these companies are talking the talk, they don’t seem to be walking the walk. 

According to a new study recently published in the journal Environmental Research Letters, companies’ deforestation-free supply chain pledges have barely impacted forest clearance in the Amazon. 

The research team from the University of Cambridge, Boston University, ETH Zurich, and New York University found corporate pledges to not purchase soybeans grown on land deforested after 2006 have only reduced tree clearance in the Brazilian Amazon by 1.6% between 2006 and 2015.  The researchers found that if these pledges had been implemented, the current levels of deforestation in Brazil could be reduced by approximately 40%.  

According to the research team, the findings of the study indicate that private sector efforts are not enough to stop deforestation. Political leadership will also be vital to forest conservation efforts.

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Companies’ ‘deforestation-free’ supply chain pledges have barely impacted forest clearance in the Amazon, researchers say

Photo, posted November 18, 2020, courtesy of Ivan Radic via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Fuel From Coffee Grounds | Earth Wise

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The world drinks a lot of coffee.  Americans alone consume 400 million cups a day.  Each cup of coffee results in about half an ounce of coffee grounds.  Adding that up, this country produces over 6,000 tons of coffee grounds each day.  While coffee grounds are not particularly harmful, that is an awful lot of waste that mostly ends up in landfills or is incinerated.

Researchers at Aston University in the UK have developed a method of producing high-quality biodiesel fuel from coffee grounds.  Their study was published in the journal Renewable and Sustainable Energy Reviews.

The technique consists of growing a particular species of microalgae (Chlorella vulgaris) directly on spent coffee grounds.  The coffee grounds provide both the nutrients for the microalgae and a structure upon which it can grow.   Exposing the algae to light for 20 hours a day and dark for just four hours a day produced the best quality biodiesel.

Microalgae is well-known as a feedstock for biodiesel production.  Previously, it has been grown on materials like polyurethane foam or nylon which don’t provide any nutrients.   Using the coffee grounds as the substrate for growth means that no external nutrients are needed.

The resultant enhanced biodiesel produces minimal emissions and good engine performance and meets both US and European specifications.  This feedstock for producing biodiesel is ideal since it doesn’t require any competition with food crops and instead makes use of a widely available waste product.  The hope is that it may reduce the cutting down of palm trees to extract oil for biofuel.  In southeast Asia, this has been a major source of deforestation and increased greenhouse gas emissions.

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Aston University researchers ‘feed’ leftover coffee grounds to microalgae to produce low emission biodiesel

Photo, posted October 13, 2007, courtesy of David Joyce via Flickr.

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