The watershed summit in 2015 was far from perfect, but its impact so far has been significant and measurable

Ten years on from the historic Paris climate summit, which ended with the world’s first and only global agreement to curb greenhouse gas emissions, it is easy to dwell on its failures. But the successes go less remarked.

Renewable energy smashed records last year, growing by 15% and accounting for more than 90% of all new power generation capacity. Investment in clean energy topped $2tn, outstripping that into fossil fuels by two to one.