Making progress will depend not only on their ability to enhance domestic programmes, but also to cooperate.
Opinion: The US and China must rebuild their climate partnership
US 2020 election: The US formally exits the Paris Agreement, but is set to re-enter in January as Joe Biden to be sworn in as the next US president
The US has left the Paris Agreement, but are set to make a swift return.
Chile under fire after pulling out of hosting COP25
Chile criticised for pulling out of hosting COP25.
A greener life, a greener world 