“The 1.5°C figure is not some random statistic,” said the head of the World Meteorological Organization. “It is rather an indicator of the point at which climate impacts will become increasingly harmful for people and indeed the entire planet.”
Source: ‘Our House Is Truly on Fire’: Earth Now Has 50% Chance of Hitting 1.5°C of Warming by 2026
1848+: The End(s) of History 