They're also highly confident that if the global surface temperature increases by more than 2 degrees Celsius over present temperatures we could see "a nearly ice-free Arctic Ocean in late summer."
The report further notes that there is increasing evidence that ice sheets are losing mass, glaciers are shrinking, Arctic sea ice cover is diminishing, snow cover is decreasing and permafrost is thawing in the Northern Hemisphere.
As for the rise in sea level, scientists asserted in the IPCC report that tide gauges and satellite data make it "unequivocal" that the world's mean sea level is on the upswing.
Even if we end emission tomorrow, climate change could continue for centuries
This may be one of the more harrowing findings in the report, as it suggests we're too far gone to effect any meaningful change in our lifetimes.
Even if we end carbon dioxide emissions today, effects could linger for hundreds, if not thousands, of years. And certain changes may already be irreversible.
"Many aspects of climate change will persist for centuries even if concentrations of greenhouse gases are stabilized. This represents a multicentury commitment created by human activities today," the report states.