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One week earlier. that says to me that there are no more cataclysmic unforeseeable events. >> reporter: in august, the united nations' intergovernmental panel on climate change says it is, quote, unequivocal that humans have caused the climate crisis. the report confirms that widespread and rapid changes have already happened, some of them irreversibly. the lead author of that report, kim cobb, explains how the earth h has warmed more than 1 degree celsius since pre-industrial levels. >> we have known for decades that rise in fossil fuel emissions are driving warming across the planet. this wa...

The report confirms that widespread and rapid changes have already happened. some of them irreversibly. a lead author of that report, kim cobb, explains how the earth has warmed more than 1 degree celsius since pre-industrial levels. >> we've, of course, known for decades that rise in fossil fuel emissions are driving warming across the planet. this warming is related to the heating of the atmosphere that has caused a 7% increase in the amount of water vapor that the atmosphere can hold. >> reporter: more water vapor leads to higher humidity, in some areas, more drought. >> we've had drought c...