… Five important natural thresholds already risk being crossed, according to the Global Tipping Points report (https://global-tipping-points.org/), and three more may be reached in the 2030s if the world heats 1.5C (2.7F) above pre-industrial temperatures. … The tipping points at risk include the collapse of big ice sheets in Greenland and the West Antarctic, the widespread thawing of permafrost, the death of coral reefs in warm waters, and the collapse of one oceanic current in the North Atlantic. Unlike other changes to the climate such as hotter heatwaves and heavier rainfall, these systems do not slowly shift in line with...