Increase in Carbon Emissions Seen Tripling Since '90s

Emissions of carbon dioxide from fossil fuel burning, the main culprit in global warming, have increased three times faster in recent years than they did in the 1990s, international climate researchers reported today.

And human-induced warming may have been responsible for an unprecedented observation reported Monday by a second group of scientists, who said that for the first time in 30 years of U.S. satellite monitoring of Antarctica, there is "clear evidence" of snowmelt on some of the continent's highest and coldest areas.