“This is yet another wakeup call: Those who deny the science or choose excuses over action are playing with fire,” U.S. Secretary of State John Kerry said in a statement. “Once again, the science grows clearer, the case grows more compelling, and the costs of inaction grow beyond anything that anyone with conscience or common sense should be willing to even contemplate.”
At this point, emissions keep rising mainly due to rapid growth in China and other emerging economies. They say rich countries should take the lead on emissions cuts because they’ve pumped carbon into the atmosphere for longer.
Climate activists said the report should spur governments to action.
“There are few surprises in this report but the increase in the confidence around many observations just validates what we are seeing happening around us,” said Samantha Smith, of the World Wildlife Fund.
The report adopted Friday deals with the physical science of climate change. Next year, the IPCC will adopt reports on the impacts of global warming, strategies to fight it and a synthesis of all three reports.