“Unfortunately, one of the planet’s most biodiverse and important ecosystems will not survive two degrees intact. The science on corals and global warming has got steadily more alarming over recent years, in tandem with the accelerated destruction of reefs by rapidly rising temperatures around the world’s tropical coastlines, as has already been described. In 2018 the IPCC had to admit that ‘tropical corals may be even more vulnerable to climate change than indicated in assessments made in 2014.’ Marine biologists watched in horror as the Great Barrier Reef suffered back-to-back bleaching events in 2016 and 2017, losing fully half its coral cover in the process. The IPCC’s latest predictions for the two-degree world are dire: even if global temperatures stay under 1.5 degrees, 70–90% of reef-building corals will be lost. With two degrees of warming, this increases to 99%.”