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Removing Carbon Dioxide Won’t Get the Job Done | Earth Wise

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Limiting global warming to no more than 1.5-2 degrees Celsius above pre-industrial levels is a crucial goal for humankind.  Countries, companies, and other organizations around the world have committed to achieving ‘net zero’ emissions.  This is distinct from zero emissions in that it includes removing carbon dioxide from the atmosphere to offset the amounts we are putting into it.  Carbon dioxide removal is increasingly touted as the way to achieve emission goals.  But it is a realistic strategy?  According to a recent paper by a leading climate scientist in the journal Nature, the answer in the short term is decidedly no.

In 2022, the world emitted 45 billion tons of carbon dioxide into the atmosphere.  Last year’s bipartisan Infrastructure Law earmarked $3.5 billion for developing four direct air capture hubs in the US.  Each of these is expected to eventually be able to extract a little over a million tons of CO2 from the air each year. These hubs combined would therefore remove about 52 minutes’ worth of the year’s emissions over the course of the year. 

The bottom line is that unless we drastically reduce emissions, all the carbon dioxide removal strategies combined will scarcely make a dent in the problem.

We will never be able to eliminate all sources of emissions, particularly from certain industries, and carbon dioxide removal will be a very important technology to address those emissions, but in the big picture, it is essential that the world decarbonizes as much as possible and as soon as possible.

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Carbon dioxide removal is not a current climate solution — we need to change the narrative

Photo, posted January 19, 2009, courtesy of Wladimir Labeikovsky via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Peak Fossil Fuels | Earth Wise

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According to a new report from the Rocky Mountain Institute, a nonprofit that studies the energy transition, we have reached a pivot point in which fossil fuels have peaked in their use for producing electricity and are about to enter a period of decline.

The report makes the case that wind and solar power are going through a growth process that looks very much like the trend lines for the early stages of other transformative products and industries – things like automobiles and smartphones.  Such growth begins slowly for technology and products that are very expensive, but then shifts into high gear as costs shrink and efficiency rises.

The argument is that fossil fuel demand has peaked in the electricity market because the annual growth in global electricity demand is now less that the amount of electricity being generated by newly-built renewable energy plants (mostly solar and wind.)  This dynamic will squeeze out the most expensive and dirtiest energy sources over time.

Overall use of fossil fuels for electricity shifted in 2018 from a long-standing period of growth to a holding pattern in which the total amount of electricity produced has no clear trend.  According to the RMI report, this plateau in fossil fuel use is likely to continue until about 2025, and then will be followed by a long-term decline.

While the trends in fossil fuel use are quite evident, the end results are not inevitable.  There continues to be a battle between the forces trying to protect the fossil fuel status quo and those trying to change it. But strong economic forces are difficult to overcome.  Renewable energy is the lowest cost source of electricity in a growing number of locations and situations.

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When Will We Hit Peak Fossil Fuels? Maybe We Already Have

Photo, posted December 27, 2015, courtesy of Gerry Machen via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Decarbonizing The Most Polluting Heavy Industries | Earth Wise

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The production of steel, cement, and ammonia accounts for about 20% of the carbon dioxide humans pour into the atmosphere.  Modern cities are largely constructed from concrete and steel and most of our food is grown using fertilizer made from ammonia. 

The most widely discussed solutions to decarbonizing these industries are green hydrogen and carbon capture and storage or CCS.

Steel manufacture is responsible for 11% of society’s emissions.  Most production starts by burning coal in a blast furnace. Using CCS could reduce emissions from burning the coal.  But the blast furnace could be eliminated entirely by the use of electrolysis to produce the pure iron needed to make steel.  This would be extremely energy-intensive but using a low-carbon source like green hydrogen could greatly reduce the emissions from making steel.

Ammonia is made by producing hydrogen from natural gas and then combining it with atmospheric nitrogen.  Both the hydrogen production and ammonia synthesis are energy intensive.  Using green hydrogen would eliminate emissions from the hydrogen production itself and new research on catalysts aims at lower-temperature, less-energy intensive ammonia synthesis.

Decarbonizing cement manufacturing is perhaps the toughest challenge.  Cement is made in a high-temperature kiln, typically heated by burning fossil fuels.  The process converts calcium carbonate and clay into a hard solid called clinker.  The main byproduct of that is even more carbon dioxide.  Burning green hydrogen and capturing carbon emission are about the best hope for reducing cement manufacturing emissions.

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Can the World’s Most Polluting Heavy Industries Decarbonize?

Photo, posted June 30, 2009, courtesy of Portland Bolt via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Reducing Emissions From Shipping And Aviation | Earth Wise

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The global marine shipping and aviation industries are each responsible for about 3% of greenhouse gas emissions.  These are relatively small numbers, but as other industries decarbonize, the contributions from shipping and aviation will loom larger and larger.

In October, both of these industries made commitments to reach net zero emissions by 2050.  How can they do it?  We don’t really have the details of the technologies to be used, and neither do these industries.  But there are ideas being considered.

For both ships and planes, the solution for short-distance trips can be electrification.  Electric planes are in the works for short distances.  Battery-powered container ships are also under development.  But the electrification of longer international and intercontinental routes for both industries is very difficult.  The size and weight of batteries needed for long hauls are major challenges to overcome.

The low-carbon solution slowly being deployed in aviation is sustainable aviation fuel made from renewable sources. Longer term, green hydrogen fuel for planes may be a solution.  For shipping, hydrogen may play an even larger role.  As in the other potential uses for hydrogen, the essential requirement is to be able to produce hydrogen in a way that does not emit greenhouse gases.

There are multiple ways to move towards the decarbonization of both aviation and shipping.  Which will turn out to be the most practical and successful is not yet known.  What is essential is for both industries to follow through on their commitments to research, develop, and deploy zero-carbon solutions.  They appear to have embraced the vision for the future.  Now comes the hard work of achieving that vision.

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Shipping & Aviation Plan To Go Net Zero. How?

Photo, posted August 8, 2014, courtesy of Tomas Del Coro via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Roads And Chimpanzees | Earth Wise

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The chimpanzee is a species of great ape native to tropical regions of Central and West Africa.  Chimpanzees are highly social animals and can live to be over 50 years old.  In fact, chimpanzees are our closest cousins.  We share about 98% of our genes with chimpanzees. 

According to the African Wildlife Federation, it’s estimated that at most only 300,000 chimpanzees remain in the wild today.  They face a myriad of challenges, including habitat degradation and hunting. 

According to new research from the University of Exeter in the U.K., roads have a negative impact on chimpanzee populations that can extend for several miles.  In the study, which was recently published in the journal Conservation Letters, the researchers analyzed the impact of major and minor roads on wild western chimpanzee numbers in the eight African countries in which they live.  They found that negative impacts extended an average of 10.7 miles from major roads, and 3.4 miles from minor roads.  The researchers found that the density of chimpanzee populations dropped steadily from the edges of these areas to the lowest value alongside the roads.  Only 4.3% of the chimpanzees’ range remains unaffected by roads. 

While the study did not investigate why roads affect chimpanzee numbers, the research team did offer some clues.  In addition to noise and roadkill, roads provide access to unexploited areas for industries that often reduce or remove chimpanzee habitats.  Roads can also restrict chimpanzee movements, and provide easier access for hunters. 

The researchers hope their findings will bring about more effective guidelines to mitigate the impact of roads on wildlife.   

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Roads have far-reaching impact on chimpanzees

Photo, posted August 12, 2014, courtesy of Rod Waddington via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

An Incentive For Carbon Capture | Earth Wise

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Convincing industries to reduce their carbon dioxide emissions has not been easy.  Many approaches have been debated, including carbon taxes, carbon tax-and-trade schemes, and passing a giant Green New Deal.  Most economists agree that putting a price on carbon is likely to be the most effective approach.

But there is already in place an adjustment to the US tax code that is more of a carrot than a stick.  It is a tax credit that is designed to make capturing CO2 a financial winner for a number of high-emitting industries.  The credit, called 45Q, was enacted in February 2018.

The 45Q credit earns industrial manufacturers $50 per metric ton of CO2 stored permanently or $35 per ton if the CO2 is put to use.  An earlier credit for capturing carbon dioxide was limited to only $20 per metric ton and was capped at 75 million tons.  Some large fossil fuel companies did make use of the earlier credit.

The new version does not have a cap, but to qualify, companies need to start constructing carbon-capture facilities within 7 years and have 12 years to claim their money.

Companies with emission-intensive operations are busy figuring out how to take advantage of the credit.  These include cement makers, steel and power plants, corn ethanol producers, and ammonia plants.

Because the credit mandates that companies start constructing their carbon-capture facilities within seven years, most companies will tend to rely on mature technologies.  But the tax credit should also drive demand for next-generation carbon-capture technologies, of which there are many under development.  Saving lots of money on taxes is likely to lure US companies to capture carbon dioxide.

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45Q, the tax credit that’s luring US companies to capture CO2

Photo, posted October 2, 2014, courtesy of Sask Power via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Extreme Heat From Solar Power | Earth Wise

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Renewable sources are playing a growing role in meeting our energy needs, but one place where they have continued to fall short is in industrial processes that require extreme heat.  These include the cement, steel, and glass industries, among others.  These industries account for a significant amount of CO2 emissions because the most effective way to reach the necessary temperatures continues to be combustion of fossil fuels.  The cement industry alone accounts for 7% of global emissions and the need for cement continues to grow.

A previously stealthy startup company backed by Bill Gates and fellow billionaire Soon-Shiong has made a breakthrough in the area of using solar energy to achieve high temperatures.  The company, called Heliogen, has created a solar oven that is capable of generating heat above 1800 degrees Fahrenheit, which is enough for high-temperature industrial processes.

The Heliogen technology uses concentrated solar power to generate heat.  Concentrated solar power uses arrays of mirrors to reflect sunlight and focus it to a single point.  That technology is not new;  there are systems that use it to produce electricity and, to some extent, heat for industry.  But it could not achieve high enough temperatures for producing cement or steel.

The new system uses computer vision software, automatic edge detection and other sophisticated technologies to focus the sun’s rays far more finely than ever before and thereby generate far higher temperatures at the focal point.

Heliogen is now focused on demonstrating how the technology can be used in a large-scale application, such as cement-making.  The selling points to industry are that not only will there be no emissions generated, but that the fuel needed to obtain their extreme heat will be free.

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Secretive energy startup backed by Bill Gates achieves solar breakthrough

Photo courtesy of Heliogen.

Earth Wise is a production of WAMC Northeast Public Radio.

A New Way To Remove CO2 From The Air

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Researchers at MIT have developed a new way of removing carbon dioxide from a stream of air that could be a powerful tool in the battle against climate change.  The new system can pull carbon dioxide out of almost any concentration level of the gas, even including the roughly 400 parts per million level currently found in the atmosphere.

The technique is described in a new paper in the journal Energy and Environmental Science and is based on passing air through a stack of electrochemical plates. The device is essentially a large battery that absorbs carbon dioxide from the air passing over its electrodes as it is being charged up, and then releases the gas as it is being discharged.

To use it, the device would simply alternate between charging and discharging.  Fresh air or some other feed gas would be blown through the system during the charging cycle and then pure, concentrated carbon dioxide would be blown out during discharging.

The specialized battery uses electrodes coated with a compound called polyanthraquinone, which is composited with carbon nanotubes.  These unique electrodes have a binary affinity to carbon dioxide, which means that they either strongly want to capture carbon dioxide or not at all, depending upon whether the device is charging or discharging.

Carbon dioxide is important in many industries such as soft drinks and greenhouse agriculture.  With this device, the stuff could literally be pulled out of the air.  And, of course, in power plants where exhaust gas is dumped into the air, these novel electrochemical cells could be used to prevent the emission of CO2 into the atmosphere.  At the right price, this could be a game changer.

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MIT engineers develop a new way to remove carbon dioxide from air

Photo, posted August 9, 2007, courtesy of William Clifford via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Lots Of Renewable Energy Jobs

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According to the International Renewable Energy Agency, there were 11 million people employed in renewable energy worldwide in 2018.  This compares with 10.3 million in 2017.  So roughly three-quarters of a million new jobs were added last year.   As more and more countries manufacture, trade and install renewable energy technologies, renewables jobs continue to reach new high levels.

The geographic footprint of renewable energy jobs is changing.  Until now, renewable energy industries have remained relatively concentrated in a handful of major markets such as China, the US, and the European Union.  But more recently, East and Southeast Asian countries have emerged alongside China as key exporters of solar technology.  Malaysia, Thailand, and Vietnam were responsible for a greater share of growth in renewables last year.  Overall, Asia has a 60% share of renewable energy jobs worldwide.

Beyond climate goals, low-carbon economic growth has become a driver for renewables technology.  Renewables deliver on all the major elements of sustainable development:  environmental, economic and social.

The solar photovoltaic industry continues to be the most dynamic renewable enterprise.  It accounts for a third of the renewable energy workforce with more than three million jobs.  

Biofuel jobs were up by 6% to over 2 million.  Wind power supports 1.2 million jobs, with onshore projects predominant.  But the offshore wind segment is gaining traction.  Hydropower is still the largest installed capacity of all renewables but is now only expanding slowly.  The hydropower sector employs 2.1 million people directly, three-quarters in operations and maintenance.

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Renewable energy market employs 11 million in 2018 – IRENA

Photo, posted January 11, 2012, courtesy of the Oregon Department of Transportation via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

The New York Climate Plan

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New York lawmakers have passed a sweeping climate plan that requires the state to eliminate almost all of its greenhouse gas emissions by 2050.  The plan calls for the phase-out of gasoline cars and oil- and gas-burning furnaces and requires all of the state’s electricity to come from carbon-free sources.

The Climate Leadership and Community Protection Act requires the state to slash its carbon emissions to 85% below 1990 levels by 2050 and to offset the remaining 15% by other means such as removing carbon dioxide from the atmosphere.  The bill requires New York to get 70% of its electricity from renewable sources by 2030.

The challenges of reaching the program’s goals are daunting.   New York has so far only reduced its emissions by 8% since 1990.  The state currently does get 60% of its electricity from carbon-free sources – mostly hydroelectric dams and nuclear power plants – but it will require offshore windfarms, ramped-up solar installations, and battery storage systems to push the numbers dramatically higher.

Transportation, which is responsible for a third of New York’s emissions, will be particularly tough to tackle.  The Trump administration is rolling back federal vehicle efficiency rules and is trying to prevent states from setting stricter standards.  Currently, electric car ownership is primarily attractive for single-family homeowners who can plug in their cars at home.  Far more pervasive charging stations – for example, all over the streets of New York City – would be needed to make electric cars practical for everyone.

The plan aims for industries to bear most of the financial burden, but supporters say that the costs of not acting on climate will be vastly greater for businesses.  The plan’s deadlines for major emissions reductions are a decade away but there will be much to do quite soon.

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New York to Approve One of the World’s Most Ambitious Climate Plans

Photo, posted September 17, 2009, courtesy of Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Sand Mining And The Environment

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In discussions of the environment, we don’t hear much about sand mining.  But sand mining is the world’s largest mining endeavor, responsible for 85% of all mineral extraction.  Sand and gravel are mined on a huge scale around the world.  The UN estimates that the total exceeds 40 billion tons a year.  Most of this activity is unregulated and unmeasured, and much of it is corrupt and environmentally destructive.

Concrete is the predominant use for sand.  Every ton of cement requires six to seven tons of sand and gravel in order to make concrete.  But sand also makes up 90% of asphalt on roads and it is used for land reclamation in places like Singapore.  Sand is also widely used in industries such as glass manufacturing and fracking.

There are different sorts of sand.  Desert sand is mostly useless for making concrete because its grains are too rounded by erosion and don’t bind well in the concrete.   Marine sand is not great for concrete either because it has to be washed clean of corrosive salts.

As a result, salt miners mostly get sand from pits on land and dredged up from lakes and riverbeds.  Dredging massive quantities of sand from rivers and lakes drastically alters river flow, erodes riverbanks, dries up tributaries, lowers water tables, and trashes wetlands and fisheries.  In many countries, this even goes on in national parks where officials turn a blind eye to the activity.  India is the world’s second-largest sand mining country (after China) and widespread illegal extraction occurs throughout the country run by highly organized and even violent “sand mafias.”

Sand mining is a huge problem and, to date, is one that is pretty much off of most people’s radar.

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The Hidden Environmental Toll of Mining the World’s Sand

Photo, posted June 3, 2017, courtesy of Andrey Talalov via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Car Parts From Agricultural Waste

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A new bio-composite material made from date palm fiber biomass could be used to produce sustainable, lightweight and low-cost parts for the automobile and marine industries.

A team of researchers from the UK has developed a date palm fiber polycaprolactone composite that is completely biodegradable, renewable,sustainable and recyclable, in contrast to synthetic composite materials reinforced by glass and carbon fibers. The team tested the mechanical properties of the material and found that it achieved better low-velocity impact resistance than traditional man-made composites.

The idea would be to use the material in non-structural auto parts such as car bumpers and door linings.   The result would be to reduce the weight of vehicles, contributing to less fuel consumption and lower emissions.  The new material can be produced using less energy than glass and carbon fibers and is biodegradable and therefore easier to recycle.

Date palm fibers are one of the most available natural fibers in many parts of the world.  The trees produce a large quantity of agricultural waste, which is mostly burned or land-filled,causing serious environmental problems.

Convincing industry to use a new class of materials such as natural-fiber reinforced composites is challenging.  First it is necessary to obtain consistent,reliable properties from the material. Then the industries need to work closely with the developers to test the materials and convince themselves of the viability of using them.  The team, led by researchers at the University of Portsmouth, has been working with industry to test the viability of parts made from a variety of other sustainable materials as well including flax, hemp, and jute.  Someday, our cars may have bumpers made from agricultural waste.

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Agricultural waste drives us closer to greener transport

Photo, posted October 27, 2017, courtesy of David Stanley via Flickr. 

Earth Wise is a production of WAMC Northeast Public Radio.

Reducing Emissions From Ships And Planes

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The global efforts to reduce carbon emissions are marked by a conspicuous omission:  the aviation and shipping industries.  These two industries contribute 6% of all man-made CO2 emissions, but have so far managed to avoid international control.   And not only are they major sources of carbon emissions, their contributions are growing three times faster than overall global CO2 emissions.

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