CSI Tornado: Chasing supercells, interviewing a homeowner sucked off his front porch in an Oklahoma tornado outbreak, and examining the path of a destructive funnel, an expert expedition shows how science is close to decoding the way a tornado works.
A report by the American Lung Association finds that air pollution has fallen to its lowest levels since the group began collecting data in 2000. The ALA credits the Clean Air Act.
In the developing world, where land-intensive wind turbines are being rapidly constructed, wind power has often turned clean energy into dirty business.
For the first time, a US appellate court has ruled that the federal government must continue to protect an animal – in this case, Yellowstone grizzly bears – in part because of consequences of global warming.