Billioniares make lots of money from fossil fuels. They also rule our governments, politicians work for them. Therefore nothing will be done. Clue for that Chinese historian of the future: billionaires.
One thing we could do: prepare legal cases for future trials of Crimes Against Humanity. Document the perps: billionaires, the politicians who work for them (including the politically active US Supreme Court Justices), and energy executives and lobbyists and PR firms. The penalty: confiscation of all their ill gotten wealth, confining them to an income that puts them in the lower 20%.