AP Science Writer
WASHINGTON (AP) -- Most Americans are already feeling man-made global warming, from heat waves to wild storms to longer allergy seasons. And it is likely to get worse and more expensive, says a new federal report that is heating up political debate along with the temperature.
Shortly after the report came out Tuesday, President Barack Obama used several television weathermen to make his point about the bad weather news and a need for action to curb carbon pollution before it is too late.
"We want to emphasize to the public, this is not some distant problem of the future. This is a problem that is affecting Americans right now," Obama told "Today" show weathercaster Al Roker. "Whether it means increased flooding, greater vulnerability to drought, more severe wildfires -- all these things are having an impact on Americans as we speak."
Climate change's assorted harms "are expected to become increasingly disruptive across the nation throughout this century and beyond," the National Climate Assessment concluded, emphasizing the impact of too-wild weather as well as simple warming.
Still, it's not too late to prevent the worst of climate change, says the 840-page report, which the Obama administration is highlighting as it tries to jump-start often-stalled efforts to curb heat-trapping gases. Said White House science adviser John Holdren: "It's a good-news story about the many opportunities to take cost-effective actions to reduce the damage."
Release of the report, the third edition of a congressionally mandated study, gives Obama an opportunity to ground his campaign against climate change in science and numbers, endeavoring to blunt the arguments of those who question the idea and human contributions to such changes. Later this summer, the administration plans to propose new regulations restricting gases that come from existing coal-fired power plants.
Not everyone is persuaded.
Some fossil energy groups, conservative think tanks and Republican senators immediately assailed the report as "alarmist." Senate Republican leader Mitch McConnell of Kentucky said Obama was likely to "use the platform to renew his call for a national energy tax. And I'm sure he'll get loud cheers from liberal elites -- from the kind of people who leave a giant carbon footprint and then lecture everybody else about low-flow toilets."
Since taking office, Obama has not proposed a specific tax on fossil fuel emissions. He has proposed a system that caps emissions and allows companies to trade carbon pollution credits, but it has failed in Congress.
Republican Sen. David Vitter of Louisiana said the report was supposed to be scientific but "it's more of a political one used to justify government overreach." And leaders in the fossil fuel industry, which is responsible for a large amount of the heat-trapping carbon dioxide, said their energy is needed and America can't afford to cut back.
"Whether you agree or disagree with the report, the question is: What are you going to do about it? To us that is a major question," said Charlie Drevna, president of the American Fuel and Petrochemical Manufacturers. He called the report "overblown."
The report -- which is full of figures, charts and other research-generated graphics -- includes 3,096 footnotes referring to other mostly peer-reviewed research. It was written by more than 250 scientists and government officials, starting in 2012. A draft was released in January 2013, but this version has been reviewed by more scientists, including twice by the National Academy of Sciences which called it "reasonable," and "a valuable resource."
Environmental groups praised the report. "If we don't slam the brakes on the carbon pollution driving climate change, we're dooming ourselves and our children to more intense heat waves, destructive floods and storms and surging sea levels," said Frances Beinecke, president of the Natural Resources Defense Council.
Scientists and the White House called it the most detailed and U.S.-focused scientific report on global warming.
The report looks at regional and state-level effects of global warming, compared with recent reports from the United Nations that lumped all of North America together.
"All Americans will find things that matter to them in this report," said scientist Jerry Melillo of the Marine Biological Laboratory, who chaired the science committee that wrote it. "For decades we've been collecting the dots about climate change; now we're connecting those dots."
In a White House conference call with reporters, National Climatic Data Center Director Tom Karl said his two biggest concerns were flooding from sea level rise on the U.S. coastlines -- especially for the low-lying cities of Miami, Norfolk, Virginia, and Portsmouth, New Hampshire -- and drought, heat waves and prolonged fire seasons in the Southwest.