Maybe if the people making these demands were to lead by example instead of living lives of such unbelievable luxury and excess in their dozen beachfront homes people would be more likely to believe them. Especially if their demands actually made logical sense, like demanding that the 15 cargo ships that out-pollute every private automobile on the planet were dealt with rather than demanding people give up meat and air conditioning and go back to living worse than medieval peasants.
Or if they didn't all seem to be coordinated in completely ignoring that China alone outpollutes basically everyone else by a huge margin, instead relying on the hilariously dishonest bait and switch of screaming "but per capita!" as if China keeping half a billion people in abject poverty while still out-polluting everyone else somehow magically undid their pollution.