EPA administrator Gina McCarthy testifies before the House Subcommittee on Energy and Power on Capitol Hill, in Washington, Wednesday, Sept. 18, 2013. The energy panel meeting Wednesday comes just days before a deadline for the Environmental Protection Agency to release a revised proposal setting the first-ever limits on carbon dioxide from newly built power plants. (AP Photo/Cliff Owen)
EPA administrator Gina McCarthy testifies before the House Subcommittee on Energy and Power on Capitol Hill, in Washington, Wednesday, Sept. 18, 2013. The energy panel meeting Wednesday comes just days before a deadline for the Environmental Protection Agency to release a revised proposal setting the first-ever limits on carbon dioxide from newly built power plants. (AP Photo/Cliff Owen)
FILE - In this July 19, 2007 file photo an iceberg melts off Ammassalik Island in Eastern Greenland. Scientists who are fine-tuning a landmark U.N. report on climate change are struggling to explain why global warming appears to have slowed down in the past 15 years even as greenhouse gas emissions keep rising. Leaked documents show there is widespread disagreement among governments over how to address the contentious issue in Sept. 23-26 stock-taking report by the Intergovernmental Panel on Climate Change. (AP Photo/John McConnico, File)
WASHINGTON (AP) ? The Environmental Protection Agency says global warming is one of the most significant public health threats of our time.
That's according to EPA Administrator Gina McCarthy. McCarthy is defending a plan to curb carbon pollution in a speech Friday morning. She says global warming is not just about melting glaciers.
The proposal is the first significant step in President Barack Obama's climate plan.
But the plan only deals with future power plants. That means there is a limit to how much it will dent the emissions blamed for global warming.
The existing fleet of power plants in the U.S. is the largest source of heat-trapping pollution. A proposal to deal with them is due next summer.
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