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Another Way To Make Solar Cells

March 21, 2019 By EarthWise Leave a Comment

Millions of rooftops now contain solar panels and the majority of the solar cells that make up those panels today are made from silicon.  Silicon solar cells require expensive, multi-step processing conducted at very high temperatures in special clean room facilities.  Despite these complications, the price of solar panels has continued to drop dramatically over the years.

But even as the price of solar cells gets lower and lower, there are still widespread efforts to find even better ways to make them.   One of those ways is with perovskite solar cells.  Perovskites are materials with a characteristic crystal structure and are quite common in nature.  Perovskites can be formed with a wide range of elements and can exhibit a variety of properties.

They were first used to make solar cells about 10 years ago and those first cells were unimpressive in most respects.  However, there has been steady progress since that time.  The potential advantages of perovskite solar cells are that they can be made from low-cost materials and can be manufactured using liquid chemistry, a far cheaper process than what is used to make silicon cells.

Researchers at MIT and several other institutions have recently published the results of research on how to tailor the composition of perovskite solar cells to optimize their properties.   What used to be a trial-and-error process can now become much more engineered and should lead to perovskite solar cells with performance that could exceed that of silicon cells.

Silicon solar panels are a huge, worldwide industry and displacing them in favor of an alternative technology is a tall order.  But if perovskite cells can be optimized for large-scale manufacturability, efficiency and durability, they could definitely give silicon a run for its money.

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Unleashing perovskites’ potential for solar cells

Photo courtesy of Ken Richardson/MIT.

Earth Wise is a production of WAMC Northeast Public Radio.

Can Germany Meet Its Energy Goals?

February 4, 2019 By EarthWise Leave a Comment

Germany has been a global leader in efforts to decarbonize its massive economy.  A national initiative known as Energiewende – or clean energy transition – has been in place since 2010 and relies heavily on renewable energy sources, energy efficiency, and energy demand management.

The program has involved some of the most aggressive deployment of renewable energy sources in the world.  Germany was the first country to install 1 GW of solar energy and still has the 5th largest amount of solar power in the world despite actually being a country with fairly limited sunshine.  Germany has nearly 30,000 wind turbines, most of which are onshore, unlike many other countries in northern Europe.  Over the past five years, government support and cost to consumers for the shift to clean energy have totaled over $180 billion.

However, despite these efforts, Germany’s greenhouse gas emissions have not declined as rapidly as expected, even though nearly 40% of the country’s electricity now comes from renewable sources.

This lack of expected success comes as a shock to the environmentally conscious German population, nearly 90% of which supports the program.

There are two major problems Germany faces.  One is that Germany is Europe’s largest producer of coal, which still generates more than a third of the country’s power.  The other is that Germany’s large auto industry is still married to gas- and diesel-fueled cars and emissions from the country’s cars are a big problem.

The Energiewende program was driven by political will and investment certainty.  It is unclear whether Germany can muster these forces again.  The Merkel government has dragged its feet on environmental issues in recent years.  It remains to be seen what effect shifting political power in Germany will have.

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Carbon Crossroads: Can Germany Revive Its Stalled Energy Transition?

Photo, posted August 15, 2011, courtesy of Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Smog And Solar Power

January 22, 2019 By EarthWise Leave a Comment

China has been struggling with some of the worst air pollution in the world.  Beijing frequently sits under a brown blanket made of exhaust gases from industry, cars and coal fires, which dump harmful particulate matter, soot, sulfur dioxide and nitrogen oxides into the air.

The human health consequences are severe.   According to the World Health Organization,air pollution contributes to about 1.6 million premature deaths in China each year.  World-wide, air pollution is implicated in over 7 million deaths annually.

Faced with this air pollution crisis, China has undertaken a wide variety of measures to improve its air and curb carbon dioxide emissions alongthe way.  Among other things, China has invested heavily in the deployment of solar power and has plans for ever greater expansion of solar power in the future.

A study by researchers at ETH in Zurich looked at the impact of China’s air pollution on the production of solar energy.  The smog in China’s cities reduces the amount of solar radiation that reaches the ground and therefore significantly reduces the power output of solar energy systems. According to the study, solar radiation would increase by an average of 11% nationwide as a result of strict air pollution control measures.  In some places, cleaning up the air would result in 26% more energy production.

China’s electric power industry is the world’s largest electricity producer, having passed the United States in 2011.  Two-thirds of the electricity in China still comes from coal, which, apart from the serious climate and health consequences associated with its use, continues to make it more difficult to switch to clean solar power.  Much work remains to be done.

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Fighting smog supports solar power

Photo, posted February 7, 2014, courtesy of Flickr. 

Earth Wise is a production of WAMC Northeast Public Radio.

Cleaner Air For China

December 5, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/12/EW-12-05-18-Cleaner-Air-for-China.mp3

For more than 15 years, the Chinese government has been grappling with some of the deadliest air pollution in the world.  Extreme pollution events are a regular wintertime occurrence and health experts estimate that more than a million people die each year in China from particulate air pollution.

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Rapid Response To Climate Change More Important Than Ever

October 17, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/10/EW-10-17-18-Rapid-Response-to-Climate-Change.mp3

The Intergovernmental Panel on Climate Change has issued a new report emphasizing the importance of taking rapid action to limit global warming to 1.5 degrees Celsius and examining the consequences of allowing temperatures to rise 2 degrees instead.

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The Problem With Flaring

October 12, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/10/EW-10-12-18-The-Problem-with-Flaring.mp3

Oil and gas are typically produced together.  If oil wells are located near gas pipelines, then the gas gets used.  But if the wells are far offshore, or it is not economical to get the gas to market, then oil companies get rid of the gas by burning it – a process known as flaring.

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The Earliest Overshoot Day Ever

October 11, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/09/EW-10-11-18-The-Earliest-Overshoot-Day-Ever.mp3

Earth Overshoot Day marks the date when humankind’s demand for ecological resources and services in a given year exceeds what our planet can regenerate in that year.  The deficit for the remainder of the year means we are liquidating stocks of ecological resources and accumulating waste, primarily carbon dioxide in the atmosphere.

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The Famous 97%

October 5, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/10/EW-10-05-18-The-Famous-97-Percent.mp3

One still hears reference to “the debate on global warming”.  Is there really a debate?  Certainly, there are people who want to think there is, especially those with a vested interest in not doing anything about it.

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A New Way To Store Hydrogen

September 20, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/09/EW-09-20-18-A-New-Way-to-Store-Hydrogen.mp3

Several major automakers including Toyota, Honda and BMW are betting that hydrogen-fueled cars will be a dominant technology in the future.  There are a number of technical and economic problems to be solved before that can happen.  Producing hydrogen in an cost-effective and environmentally-friendly way is critical.  But beyond that, one of the biggest challenges is the transportation and storage of hydrogen.

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Reducing Slavery In Seafood

August 28, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/08/EW-08-28-18-Reducing-Slavery-in-Seafood.mp3

The seafood industry is one of the largest employers in the world.  But according to a 2016 report, the seafood industry also contains widespread forced labor.   Forty seven seafood-producing countries were reported to utilize forced labor.  The seafood hub countries of Indonesia, Thailand, Vietnam, Peru, and the Philippines were also reported to use a significant percentage of child labor.

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Greener Concrete

August 23, 2018 By EarthWise 1 Comment

https://earthwiseradio.org/wp-content/uploads/2018/07/EW-08-23-18-Greener-Concrete.mp3

The battle to reduce carbon emissions is heavily focused on electricity generation, transportation, buildings, and agriculture, which collectively account for more than 75% of the total.  However, there are other sources of carbon emissions that cannot be ignored.  Among industrial activities, the production of cement is responsible for 7% of industrial energy use and is the second largest industrial emitter of carbon dioxide.  Making cement accounts for about 7% of global emissions.

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Clean Power Is Not Enough

August 17, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/07/EW-08-17-18-Clean-Power-is-Not-Enough.mp3

A recent study published in Nature Climate Change looked at what emission reductions are needed to meet the climate targets of the Paris Accords.  The results are sobering.

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Bursting The Carbon Bubble

July 25, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/06/EW-07-25-18-Bursting-the-Carbon-Bubble.mp3

One way or another, the fossil fuel industry seems to be destined to shrink away.  A combination of technological advances and climate policies are going to drastically reduce the global demand for fossil fuels over the course of time.   New research shows that the demise of the fossil fuel industry will have profound consequences.

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Tourism And Greenhouse Gas Emissions

June 29, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/05/EW-06-29-18-Tourism-and-Greenhouse-Gas-Emissions.mp3

Tourism is a significant contributor to global gross domestic product.  Furthermore, it is growing at an annual rate of 4%, more than many other economic sectors.  There are many places around the world where it is the largest industry.  But until recently, there really wasn’t very good information about its carbon footprint.

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The Fight For Greener Cars

June 28, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/06/EW-06-28-18-The-Fight-for-Greener-Cars.mp3

U.S. automakers have always been reluctant partners in the nation’s efforts to reduce air pollution and improve fuel efficiency. There have been struggles for decades between the carmakers and the government in setting Corporate Average Fuel Economy (or CAFÉ) standards.  During the Obama administration, some of the most demanding fuel economy and emissions standards were mandated.

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Renewable Energy Jobs

June 26, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/05/EW-06-26-18-Renewable-Energy-Jobs.mp3

According to a new report by the International Renewable Energy Agency, more than half a million new jobs were generated by the renewable energy industry last year, an increase of 5.3% when compared with 2016.  The total number of people working in the renewables sector – which includes large hydropower facilities – has now exceeded 10 million people worldwide.

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European Diesel Under Siege

June 5, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/06/EW-06-05-18-European-Diesel-Under-Seige.mp3

Diesel cars have never been very popular in the US and in the aftermath of the so-called Dieselgate scandal at Volkswagen, they are even less so.  Less than a dozen diesel car models are available for purchase in the US and only one of those is from a German automaker: BMW.

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A Milestone For Energy Storage

April 24, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/04/EW-04-24-18-A-Milestone-for-Energy-Storage.mp3

The United States has now added the capacity to store a billion watts of power for one hour and it may double that total by the end of this year.   According to the firm GTM Research, the energy storage industry – previously nearly invisible – is undergoing rapid growth.  Much of the growth has been in homes with products like the Tesla Powerwall but has also been on the scale of the electric grid, where power companies can use storage to control when to deploy excess electricity generated from renewable sources such as solar power.

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An Ancient Way To Store Energy

November 6, 2017 By EarthWise 2 Comments

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-11-06-17-An-Ancient-Way-to-Store-Energy.mp3

Firebricks, which are bricks designed to withstand high heat, have been around for more than 3000 years.  The Hittites used them to line iron-smelting kilns.  They are simply bricks made from clays that can withstand much higher temperatures than ordinary bricks.

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Dioxane And Drinking Water

October 24, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-10-24-17-Dioxane-And-Drinking-Water.mp3

A byproduct of plastics production, dioxane is a clear, synthetic, liquid solvent that easily mixes with water.  It’s frequently used in paint strippers, dyes, and varnishes, as well as shampoos and body washes – particularly those that are sudsy.  Dioxane doesn’t really biodegrade and is widely regarded as a contaminant.    

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