"A new study suggests the Arctic is headed for a permafrost meltdown that will release greenhouse gases equal to half the emissions of the entire industrial age."

"An ingredient used in Coca-Cola and Pepsi is a cancer risk and should be banned, an influential lobby group has claimed."

"Neighbors of a toxic mine in northern Nevada have filed a class-action lawsuit against BP America and Atlantic Richfield Co. accusing them of intentionally and negligently concealing the extent of the contamination leaking off the abandoned site for decades."

The BP Gulf oil spill reminded us that spill-response technology had barely advanced for decades. But a new product tested during the spill may offer a leap forward in removing oil from water.

The Pacific island nation of Kiribati is generally only 6.5 feet above sea level. That means 6.5 feet above oblivion as sea levels are predicted to rise up to 3 feet by the end of the century. But many islanders remember God's biblical promise to Noah that he would never send another flood.

"A drawn-out fight over the guidelines for thyroid patients who are given radioactive drugs has taken a new turn, with a decision by the Nuclear Regulatory Commission that it is not a good idea for them to go to hotels."

"Monarch butterfly colonies in Mexico more than doubled in size this winter after bad storms devastated their numbers a year ago, conservationists said on Monday although the migrating insect remains under threat."