It seems like such a simple question: How hot is Earth going to get? Yet for 40 years, climate scientists have repeated the same unsatisfying answer. If humans double atmospheric carbon dioxide (CO2) from preindustrial levels, the planet will eventually warm between 1.5°C and 4.5°C. A recent assessment, conducted under the World Climate Research Programme (WCRP) support a likely warming range of between 2.6°C and 3.9°C.
By Paul Voosen. Science. July 22, 2020.