"The indicators show unequivocally that the world continues to warm," Thomas R. Karl, director of the National Climatic Data Center, said in releasing the annual State of the Climate report for 2010.
The world's climate is not only continuing to warm, it's adding heat-trapping greenhouse gases even faster than in the past, researchers said Tuesday.
Indeed, the global temperature has been warmer than the 20th century average every month for more than 25 years, they said at a teleconference.
"There is a clear and unmistakable signal from the top of the atmosphere to the depths of the oceans," added Peter Thorne of the Cooperative Institute for Climate and Satellites, North Carolina State University.
Carbon dioxide increased by 2.60 parts per million in the atmosphere in 2010, which is more than the average annual increase seen from 1980-2010, Karl added. Carbon dioxide is the major greenhouse gas accumulating in the air that atmospheric scientists blame for warming the climate.