22 Aug 2012:
Solar Shingles Made from
Common Metals Offer Cheaper Energy Option
U.S. scientists say that emerging photovoltaic technologies will enable the production of solar shingles made from abundantly available elements
rather than rare-earth metals, an innovation that would make
solar energy cheaper and more sustainable. Speaking at the annual meeting of the American Chemical Society, a team of researchers described advances in solar cells made with abundant metals, such as copper and zinc. While the market already offers solar shingles that convert the sun’s energy into electricity, producers typically must use elements that are scarce and expensive, such as indium and gallium. According to Harry A. Atwater, a physicist at the California Institute of Technology, recent tests suggest that materials like zinc phosphide and copper oxide could be capable of producing electricity at prices competitive with coal-fired power plants within two decades. With China accounting for more than 90 percent of the world’s rare-earth supplies — and prices rising sharply — companies and nations are racing to find new sources of rare earth minerals, which are used in everything from solar panels to smart phones.
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Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s unspoiled coral reefs. View the gallery.
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The Warriors of Qiugang
, a Yale Environment 360
video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
Watch the video.
Top Image: aerial view of Iceland
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A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.