Arctic sea ice coverage appears to have reached its lowest extent for 2008 and the second-lowest amount recorded since the dawn of the satellite era.

NASA and its partners explore a tantalizing link between pollen and some dangerous health conditions.

NASA researchers have identified feasible emission scenarios that could keep carbon dioxide below levels that some scientists have called dangerous for climate.

For the first time in the 2008 hurricane season, there are four tropical cyclones active in the Atlantic Ocean basin on one day.