The Chinese leadership understands several things very clearly:
- The country has experienced multiple catastrophic natural disasters in the past.
- Such disasters often lead to regime change (losing the mandate of heaven via natural disasters leading to social unrest)
- The leadership is comprised of smart people (and a lot of engineers) and they don't play dumb political games like denying the reality of climate change.
- Climate change will bring far worse problems in future, which threatens the country's economic growth and therefore their hold on power.
So they have massive incentive to care about the reality of climate change and do everything they can to mitigate it and protect their environment.