Guterres wanted world leaders to tackle subsidies for fossil fuels, implement taxes on carbon, and end new coal power beyond 2020. None of this happened.
At current rates of reduction, the UK's fair carbon budget will be spent in just four years' time.
Putting all of our eggs in the net zero basket is merely kicking the can down the road.
The Committee on Climate Change criticises slow progress, but has little to say about how to reconfigure government to make climate action a priority.
Academic research has awakened society to the scale of the climate emergency – now universities must lead the way on the solution.
The bold pronouncements of 2019 must mean something through the 2020s and beyond.
Contrary to the advice of the UK's climate advisers, aiming for net zero before 2050 is credible – but the country must reassess how much its future is worth.