National policies to maximize the benefits of wind farms while lessening their environmental impacts may be needed. (p. 365)

Chemicals that prevent grease from seeping through food packaging can transform into a suspected carcinogen. (p. 341)

The United States emitted nearly 1 percent more greenhouse gases in 2005 than it did in the year before. (p. 318)

Switching the nation's vehicles from gasoline to ethanol may not reduce air pollution. (p. 278)

New research explains why a cancer-causing form of chromium has been turning up in ground and surface waters far from industrial sources. (p. 254)

Industrial facilities in the United States released more than 4 billion pounds of chemicals into the environment in 2005, according to the Environmental Protection Agency's Toxics Release Inventory. (p. 253)

Portable electricity generators are frequently the culprit in domestic carbon monoxide poisonings—even when the devices sit outside the home. (p. 237)

A technique that encapsulates cells in polymer might one day benefit people who receive pancreas-cell transplants for diabetes. (p. 211)

A new study suggests how prions, the infectious agents that cause such disorders as chronic wasting disease, behave in soil and landfills. (p. 222)

A family of chemicals implicated in testosterone declines may also be contributing to recent spikes in obesity and diabetes. (p. 179)