10 Sep 2012:
Wind Resources Could Meet
Global Energy Demands, Study Says
The earth contains enough wind energy to meet all of humanity’s power needs
if future technologies are able to tap into high-altitude winds, a new study says. Using models to quantify wind energy potential,
researchers at the Carnegie Institution for Science and the Lawrence Livermore National Laboratory calculated that more than 400 terrawatts of power could be extracted from the planet’s surface winds — which could be accessed with land- and ocean-based turbines — and more than 1,800 terrawatts could be generated by high-altitude winds using technologies that combine turbines and kites. Currently human civilization uses about 18 terrawatts of power. The researchers’ calculations, which are described in the journal Nature Climate Change
, are based on global geophysical limits, and do not take into consideration technical or economic limitations. The study said the effects of extracting enough wind power to meet current global demand would be minimal as long as turbines are scattered worldwide.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
Ugandan scientists monitor the impact of climate change on one of Africa’s most diverse forests and its extraordinary wildlife. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
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.