Researchers have also predicted more intense monsoons with climate change. Warmer air can hold more water and impart more energy to weather systems, changing the dynamics of storms and where and how they hit.
Thailand is now coping with massive flooding from monsoonal rains — an event that illustrates how climate is also connected with other manmade issues such as population growth, urban development and river management, Schmidt said.
In fact, the report says, "for some climate extremes in many regions, the main driver for future increases in losses will be socioeconomic" rather than a result of greenhouse gases.
The panel was formed by the United Nations and World Meteorological Organization. In the past, it has discussed extreme events in snippets in its report. But this time, the scientists are putting them all together.
The report, which needs approval by diplomats at the mid-November meeting, tries to measure the confidence scientists have in their assessment of climate extremes both future and past.
Chris Field, one of the leaders of the climate change panel, said he and other authors declined to comment because the report is still subject to change.
The summary chapter did not detail which regions of the world might suffer extremes so severe as to leave them only marginally habitable.
The report does say scientists are "virtually certain" — 99 percent — that the world will have more extreme spells of heat and fewer of cold. Heat waves could peak as much as 5 degrees hotter by mid-century and even 9 degrees hotter by the end of the century.
From June to August this year in the United States, blistering heat set 2,703 daily high temperature records, compared with only 300 cold records during that period. That made it the hottest summer in the U.S. since the Dust Bowl of 1936, according to Weather Underground Meteorology Director Jeff Masters, who was not involved in the study.
And there's an 80 percent chance that the killer Russian heat wave of 2010 would not have happened without the added push of global warming, according to a study published last week in the Proceedings of the National Academy of Sciences.
Scientists expect future hurricanes and other tropical cyclones to have stronger winds, but they won't increase in number and may actually decrease.
Massachusetts Institute of Technology meteorology professor Kerry Emanuel, who studies climate's effects on hurricanes, disagrees and believes more of these intense storms will occur.