Lead Author  of the IPCC Sixth Assessment Report · Author of Humanity’s Moment: A Climate Scientist’s Case for Hope · Sunburnt Country · Contributor to The Climate Book, ed. Greta Thunberg · Not Too Late, eds. Rebecca Solnit, Thelma Young Lutunatabua

We're really starting to witness serious climate extremes that can no longer be ignored. And the IPCC, one of our key conclusions to that report was that effectively the human fingerprint on the climate system is now undeniable. It is now an established fact that we have warmed every single continent, every ocean basin on the planet. And again, that's a pretty serious thing to contemplate that human activity from the burning of fossil fuels and the clearing of land has led to this energy imbalance in the earth system, which is leading to a rapidly shifting climate.