James Mattis’ unpublished testimony before a Senate panel recognizes a threat others in the administration reject or minimize: climate change. He's concerned that we aren't prepared for attack on newly created water routes.
A major part of Rio’s winning Olympic bid was a plan to capture and treat 80 percent of the sewage that flows into Guanabara Bay, something organizers now admit will not happen — certainly not by August, if ever.
The March for Science: What is it, and what does it hope to accomplish?
Some 600 million people in Africa live without reliable access to electricity, according to the International Finance Corp., a division of the World Bank. The big question is how willing governments and nonprofits will be to invest in solar systems.
Mohawks become first tribe to take down a federal dam
A century after the first commercial dam was built on the St. Regis River, blocking the spawning runs of salmon and sturgeon, the stream once central to the traditional culture of New York's Mohawk Tribe .
From Cape Town to Kinshasa: could the Great Inga dam power half of Africa?