WASHINGTON (AP) — The Obama administration is more certain than ever that global warming is changing Americans' daily lives and will worsen — conclusions that scientists will detail in a massive federal report to be released Tuesday. Once people thought global warming was more in the future and more of an issue in other parts of the world, but the National Climate Assessment will emphasize how the United States is already paying the multibillion-dollar price for man-made climate change, said study co-author Donald Wuebbles, a climate scientist at the University of Illinois. The draft came out just as meteorologists calculated that 2012 was the hottest year on record for the United States, but last year was slightly cooler than the 20th century average. [...] in the time since the draft report was released, the United States has seen lots of extremes. California's drought, where a few rural places are in danger of running out of water.