The Cop26 UN climate summit in Glasgow in 2021 represented a high-water mark in climate diplomacy, and in hope for global unity. Two weeks in Scotland that year resulted in all countries affirming they would strive to limit global heating to 1.5C, with most setting net zero goals and national plans to cut greenhouse gas emissions, halt deforestation, protect nature and boost renewable energy.
It wasn’t perfect: the plans would still result in about 2.8C of heating, though they agreed to work on strengthening them, and a commitment to phase out coal was weakened at the last minute to a phase down instead. But the direction of travel was clear: the whole world agreed on how to fight the climate crisis. The Paris agreement of 2015 bound countries to keep temperatures “well below” 2C above preindustrial levels, with 1.5C as an aspiration, but at Glasgow the 1.5C limit – in line with scientific advice, which warns of dire consequences beyond that threshold – was adopted as the clear goal.
