Nothing, not even the creation of huge plantations of trees to absorb carbon dioxide, is a viable alternative to drastic cuts in greenhouse gas emissions.
From the Himalayas to Switzerland, glaciers are melting, threatening vital water supplies and increasing the risk of sea-level rise.
New research indicates that weather patterns are becoming more volatile and extreme, so farmers must find new ways to adapt.
The Chinese government is committed to stringing eight new ultra-high-voltage power lines, designed mainly to transmit electricity from wind farms, across the country.
By an overwhelming margin, the Hawaii Legislature has just passed a bill to have 100 percent of the state's energy come from renewable sources by 2045.
I was a junior in high school on April 22, 1970, on the first Earth Day, when environmentalism meant something different than it does now.
President Obama has long expressed concern about climate change and its impacts, and was mocked by Mitt Romney for saying he wanted to stop the rising of the seas.