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.
She and other scientists held a telephone briefing on the report Monday.
That report will feature an "explosion of new data" on observations of current global warming, Solomon said.