They do.
All three countries have environmental activists. Some cite Thunberg as an influence (there is a girl in China who did a similar school strike). Why would you think those places don't have activists?
Are you kidding? In China any protestor against Climate change would be swiftly removed and sent to forced labor camps or mysteriously disappear and be assassinated. https://foreignpolicy.com/2019/09/2...t-hong-kong-police-beijing-hiv-whistleblower/
Even protestors against the Chinese Government, in Hong Kong, are being kidnapped and sent back to Mainland China. Of course this is nothing more than the Communist tyranny of the left, which is revered by Bernie Sanders and his ilk.
https://www.bbc.com/news/world-asia-35275309