Draft of climate report maps out 'highway to extinction'

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...However, the number of species going extinct rises with the heat, as does the number of people who may starve, or face water shortages, or floods, according to the projections in the draft report obtained by The Associated Press...

The final document will be the product of a United Nations network of 2,000 scientists as authors and reviewers, along with representatives of more than 120 governments as last-minute editors. It will be the second volume of a four-volume authoritative assessment of Earth's climate being released this year. The last such effort was in 2001. (Volume 1: Humans 'very likely' cause warming)

The report says global warming has already degraded conditions for many species, coastal areas and poor people. With a more than 90 percent level of confidence, the scientists in the draft report say man-made global warming "over the last three decades has had a discernible influence on many physical and biological systems."

But as the world's average temperature warms from 1990 levels, the projections get more dire. Add 1.8 degrees Fahrenheit -- 1 degree Celsius is the calculation scientists use -- and between 400 million and 1.7 billion extra people can't get enough water, some infectious diseases and allergenic pollens rise, and some amphibians go extinct.

But the world's food supply, especially in northern areas, could increase. That's the likely outcome around 2020, according to the draft.

Add another 1.8 degrees and as many as 2 billion people could be without water and about 20 percent to 30 percent of the world's species near extinction. Also, more people start dying because of malnutrition, disease, heat waves, floods and droughts -- all caused by global warming.

That would happen around 2050, depending on the level of greenhouse gases from the burning of fossil fuels.

...and it gets worse...