They also said (with slightly less confidence, but still classified as "likely") that "1983–2012 was likely the warmest 30-year period of the last 1400 years."

Scientists and activists are putting emphasis not just on the conclusions of the report, but on the overwhelming support that those conclusions have in the scientific community. In addition to listing the huge numbers of researchers who contributed to the data, 50 international editors spent months crafting the language of the report to avoid any misunderstandings or misinterpretations. The panel spent the last week in closed door meetings in Stockholm, polishing the final draft. The activist group Avaaz came out to demonstrate the support being given to report by building this giant unbalanced see-saw, showing all the climate scientists one one end.

Despite the dire warnings, there are some scientists who say the panel didn't go far enough. The New York Times quotes one researcher who believes the panel is too conservative in its estimates of future increases in temperatures and ocean levels. Meanwhile, that five-percent window is enough for climate change denialists to fight back, which they are already doing.

The report does say that it's not too late to undo some of the damage, but the world is not moving in the right direction. In order to keep warming below the target level of 3.6 degrees Fahrenheit, humans would have limit the total amount of carbon burned into the atmosphere to one trillion tons. The world has already burned half a trillion tons since the beginning of the Industrial Revolution, and at its current pace, will reach one trillion in the year 2040.

The full report will be released on Monday morning, but you can read the detailed summary at the IPCC website.

This article is from the archive of our partner The Wire.