Gov. Jerry Brown, in an ominous appeal on climate change, said Tuesday that the world may already have “gone over the edge” on global warming and that humanity must reverse course or face extinction.
“We don’t even know how far we’ve gone, or if we’ve gone over the edge,” Brown said at a climate summit at the Vatican. “There are tipping points, feedback loops, this is not some linear set of problems that we can predict. We have to take measures against an uncertain future which may well be something no one ever wants. We are talking about extinction. We are talking about climate regimes that have not been seen for tens of millions of years. We’re not there yet, but we’re on our way.”