Global warming is here.

Let's hope the scientists have some ideas on what we can do to help mitigate what is coming.

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.

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The report will draw on already published peer-review science. Some recent scientific studies show that temperatures are the hottest in thousands of years, especially during the last 30 years; ice sheets in Greenland in the past couple years have shown a dramatic melting; and sea levels are rising and doing so at a faster rate in the past decade.

Also, the second part of the international climate panel's report — to be released in April — will for the first time feature a blockbuster chapter on how global warming is already changing health, species, engineering and food production, said NASA scientist Cynthia Rosenzweig, author of that chapter.

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. Predictions for the future of global warming in the report are based on 19 computer models, about twice as many as in the past, Solomon said.

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 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.