Wind farms could generate as much as 7 percent of U.S. electricity in 15 years, but the threat spinning blades pose to birds and bats should be studied more closely, a panel of the National Research Council said Thursday in a study requested by Congress.

A butterfly found only at a popular Nevada off-road vehicle site won't receive federal protection as a threatened or endangered species, the U.S. Fish and Wildlife Service decided Wednesday.

Nations racing to finish a report mapping out measures to combat global warming split on Thursday over an effort by China to water down proposed limits on the growth of greenhouse gases in the atmosphere, delegates said.

More than three dozen scientists have signed a letter to protest a new Bush administration interpretation of the Endangered Species Act, saying it jeopardizes animals such as wolves and grizzly bears.

Wind farms could generate as much as 7 percent of U.S. electricity in 15 years, but the threat spinning blades pose to birds and bats should be studied more closely, a panel of the National Research Council said Thursday in a study requested by Congress.

International delegates reached an agreement early Friday on the best ways to combat climate change despite efforts by China to water down language on cutting destructive greenhouse gas emissions.