How we know carbon dioxide in the atmosphere is increasing — and it's our bad.
Pollen season is lengthening in proportion to warming observed in North America: An extra two weeks, on average, across Wisconsin, Nebraska, and Minnesota.
Scientists are becoming more adept at projecting climate conditions using advances in computer modeling techniques.
A new study says that melting snow and ice cover in the Northern Hemisphere is causing more warming than computer models predicted.
Climate research offers little reason to believe that the snowy start to the year in the Colorado Basin is a harbinger of wetter times to come.
With drought, increasing water consumption, and climate change, the Colorado River Basin appears headed for a day of reckoning.
Arctic sea ice extent hit a new low for the month of December as the Arctic stayed unusually warm.
Researchers using different techniques have arrived at a similar conclusion: 2010 was a remarkably warm year. But did it set a new record?