On 10 November – the day after Donald Trump’s election – American and non-American delegates at the annual UN Climate Conference in Marrakech (Morocco) stood stunned and confused. Had the great achievements in the recent past, the Paris Climate Agreement, the Kigali Amendment to reduce CHF gasses, the commitments by almost all governments and thousands of businesses, investors and social groups to act on climate change become undone? Had the ‘inevitable’ transition to a low-carbon economy been stalled? On the eve of Trump’s inauguration, there is little doubt that his climate scepticism is more than rhetoric; Trump is bad news for the US and for our planet. Nonetheless, we may see some silver linings, as action on climate change is unstoppable.