Arctic regions saw some of the greatest recorded surface-temperature anomalies in 2010.
Photo: Ville Miettinen Extra Large Image

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Graph of arctic sea ice volume, measured from 1980 to 2010.
Image: University of Washington Polar Science Center Extra Large Image

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Measured global carbon-dioxide levels, in parts per million, from 2006 through 2010.
Image: NOAA Extra Large Image

A flooded New Orleans neighborhood after Hurricane Katrina.
Photo: Jocelyn Augustino/ FEMA

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The Aldo Leopold Legacy Center in Baraboo, Wisconsin, was the highest LEED-points-scoring building to date at the time of its LEED Platinum certification in 2007.
Photo: Kevin Matthews/ Artifice Images Extra Large Image

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PassivHaus-certified buildings, such as the Grundschule Riedberg in Frankfurt, Germany, require significantly less energy for heating and cooling than conventional building stock.
Photo: Kevin Matthews/ Artifice Images Extra Large Image

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The Green Mountain Habitat for Humanity Passive House in Charlotte, Vermont, combines classic New England style with game-changing energy efficiency.
Photo: J.B. Clancy/ Albert, Righter & Tittmann Architects, Inc. Extra Large Image

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Kroon Hall, the home of the Yale School of Forestry & Environmental Studies, is LEED Platinum-certified.
Photo: © Robert Benson Extra Large Image