Ros Atkins, BBC, looks at the biggest CO2 emitters in the world, their promises, and what they are doing. And whether it is enough, says climate scientist.
This is the first installment of the series and it focuses on China as the largest emitter in the world. China is responsible for 27% global CO2 emissions. It has also announced its intention to become carbon neutral by 2060.
Experts agree that China is a key player in the global effort to combat climate change. But, are they moving fast enough?
