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Human influence on the planet's climate is clear and having "widespread and consequential impacts on human and natural systems," some of which may be irreversible, says a draft report out today from a United Nations science panel.

The U.N. Intergovernmental Panel on Climate Change (IPCC) document is the final part of the group's Fifth Assessment Report, which synthesizes three earlier large reports on various aspects of climate change. There's little in this document not covered in the others, but the language is more stark.

The IPCC is a group of researchers and scientists from around the world who monitor recent climate science and release reports every several years about the latest scientific findings.

The report states that the cause of this climate change is man-made emissions of greenhouse gases, which are "the highest in history" and probably "unprecedented in at least the last 800,000 years."

The recent uptick in carbon dioxide levels is correlated with a rise in global temperatures of about 1.5 degrees since the early 1800s.

"Without additional mitigation, and even with adaptation, warming by the end of the 21st century will lead to high to very high risk of severe, widespread and irreversible impacts globally, " it says.

The report says that if carbon dioxide and other greenhouse gases continue to be emitted at the current rate, it's likely that by 2050, temperatures will rise by about 3.6 degrees Fahrenheit, when compared with the temperatures from 1986 to 2005.

By 2100, temperatures could be about 6.7 degrees warmer. Though it wouldn't occur for hundreds of years, the huge sheet of ice over Greenland could melt entirely, leading to as much as a 23-foot rise in world ocean levels, leaving many coastal cities underwater.

This 127-page draft report, obtained by USA TODAY Tuesday, could change before its official release in Copenhagen in October.

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