Key points: “It’s now or never, if we want to limit global warming to 1.5°C,” IPCC Working Group III co-chair Jim Skea said. The 1.5 degrees Celsius goal is the aspirational temperature threshold ascribed in the landmark 2015 Paris Agreement. The IPCC’s latest report follows a series of mind-bending extreme weather events worldwide. For instance, in just the last few weeks, an ice shelf the size of New York City collapsed in East Antarctica following record high temperatures and heavy rains deluged Australia’s east coast, submerging entire towns. The IPCC has warned that about half of the world's population is...