Much of the spending of a few western governments.
The majority of the world's governments do nothing except maybe wait for their "climate justice" handouts. And of course, as soon as the first-world nations have ended their dependence on oil and gas, both will get cheaper. So the rest of the world will "pick up the slack" and consume all the rest of the available fossil fuels, because they are getting real cheap now. Far cheaper than any renewable energy sources can ever hope to be since oil/gas-producing nations have to keep the good times (and the buck) rolling, in their own interest (or at least the interest of their ruling class).
What we do need is rather a closure of the world's oil/gas fields and coal mines, in the rather short term, by agreement of the respective governments or by changing those governments until they agree. Yes, this will be ugly.
But anything else is rearranging deck chairs on the Titanic.