‘Limit overshoot, peak, decline’: A new global goal for climate change?

The signing of the Paris Agreement by 200 countries in 2015 was a rare moment of global unity, and the euphoria was real.

To cheers and tears, the international climate treaty was approved by nearly every country in the world. Fundamental to the agreement was a commitment to keeping temperatures from rising beyond 1.5C (2.7F) above the pre-industrial levels of the mid 19th-century.

But 11 ...