SCIENCE

Reuters: No Doubts Global Warming Is Real Say US Experts

WASHINGTON (Reuters) - There can be no doubt that global warming is real and is being caused by people, two top U.S. government climate experts said.

Industrial emissions are a leading cause, they say -- contradicting critics, already in the minority, who argue that climate change could be caused by mostly natural forces.

"There is no doubt that the composition of the atmosphere is changing because of human activities, and today greenhouse gases are the largest human influence on global climate," wrote Thomas Karl, director of the National Oceanic and Atmospheric Administration's National Climatic Data Center, and Kevin Trenberth, head of the Climate Analysis Section at the National Center for Atmospheric Research.