"Across the Far North, populations of caribou — an indispensable source of food and clothing for indigenous people — are in steep decline. Scientists point to rising temperatures and a resource-development boom as the prime culprits."

"A new generation of prospectors is eager to explore the ocean floor. Will deep-sea digging damage one of the earth’s most valuable ecosystems?"

"Environmental degradation and waning natural resources threaten U.S. security in the 21st century, in a shift from 'kinetic' security threats, defense experts told a Capitol Hill briefing Wednesday."

"Several Asian countries in addition to China could soon challenge the United States in the race to build a renewable energy industry if Washington doesn't provide more incentives for its domestic business, venture capitalists and others told a Congressional hearing on Wednesday."

"The world's most deadly form of human malaria, a parasite known as Plasmodium falciparum, is of gorilla origin, and not chimpanzee, bonobo or ancient human origin as scientists previously thought."

The U.S. is expected to announce today that it will contribute to a U.N. effort to address the problem of indoor wood cookstoves whose smoke kills an estimated 1.9 million people annually.

"SUKKUR, Pakistan — Suhani Bunglani fans flies away from her two baby girls as one sleeps motionless while the other stares without blinking at the roof of their tent, her empty belly bulging beneath a green flowered shirt. Their newborn sister already died on the ground inside this steamy shelter at just 4 days old, after the family's escape from violent floods that drowned a huge swath of Pakistan. Now the girls, ages 1 and 2, are slowly starving, with shriveled arms and legs as fragile as twigs."

"The new UN humanitarian chief has warned that after the Asian tsunami, the Haiti earthquake and the Pakistan floods, the world must brace for a growing number of disasters that will need a new battle campaign."

"The ozone layer that shields life from the sun's harmful rays is projected to recover from harmful chemicals by mid-century, but it will take longer over the polar regions, a United Nations study said on Thursday."

"So far, 2010 is tied for the warmest year on record, and Arctic sea ice reached its third-lowest level, prompting thousands of walruses to haul themselves out of ice-starved waters, U.S. scientists said on Wednesday."