UN warns of imminent breach of critical warming threshold.

The United Nations weather agency has forecasted a 66% likelihood that the world will temporarily hit a key warming limit within the next five years, with a year averaging 1.5 degrees Celsius warmer than the mid-19th century. This number is critical because the 2015 Paris climate agreement set 1.5 degrees Celsius as a global guardrail in atmospheric warming. Scientists expect a temporary burst of heat from El Nino to supercharge human-caused warming from the burning of coal, oil, and gas to new heights.