The Paris Agreement on climate change has been widely hailed as a diplomatic triumph, but it commits its signatories only to a process, not to anything of substance. It represents a gamble: that if enough governments say they will act, they will believe each other and have the confidence to move forward – and that businesses and investors will believe them too. Six years later, the gamble appears to be succeeding, but despite this, progress is nowhere near fast enough. Global emissions of greenhouse gases are still going up.