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(CNN)-WASHINGTON (AP) -- Human-caused global warming is here -- visible in the air, water and melting ice -- and is destined to get much worse in the future, an authoritative global scientific report will warn next week.
"The smoking gun is definitely lying on the table as we speak," said top U.S. climate scientist Jerry Mahlman, who reviewed all 1,600 pages of the first segment of a giant four-part report. "The evidence ... is compelling."
Andrew Weaver, a Canadian climate scientist and study co-author, went even further: "This isn't a smoking gun; climate is a batallion of intergalactic smoking missiles."
The first phase of the Intergovernmental Panel on Climate Change is being released in Paris next week
This segment, written by more than 600 scientists and reviewed by another 600 experts and edited by bureaucrats from 154 countries, includes "a significantly expanded discussion of observation on the climate," said co-chair Susan Solomon a senior scientist for the U.S. National Oceanic and Atmospheric Administration.
That report will feature an "explosion of new data" on observations of current global warming, Solomon said.
Global warming is "happening now, it's very obvious," said Mahlman, a former director of NOAA's Geophysical Fluid Dynamics Lab. "When you look at the temperature of the Earth, it's pretty much a no-brainer."
Look for an "iconic statement" -- a simple but strong and unequivocal summary -- on how global warming is now occurring, said one of the authors, Kevin Trenberth, director of climate analysis at the National Center for Atmospheric Research, also in Boulder.
And the early draft adds: "An increasing body of evidence suggests a discernible human influence on other aspects of climate including sea ice, heat waves and other extremes, circulation, storm tracks and precipitation."
As confident as scientists are about the global warming effects that they've already documented, they are as gloomy about the future and even hotter weather and higher sea level rises.
In 2001, the panel said the world's average temperature would increase somewhere between 2.5 and 10.4 degrees Fahrenheit and the sea level would rise between 4 inches and 35 inches by the year 2100. The 2007 report will likely have a smaller range of numbers for both predictions, Pachauri and other scientists said.
The future is bleak, scientists said.
"We have barely started down this path," said chapter co-author Richard Alley of Penn State University