Ideally? Mobilize like WW2 to decarbonize the economy. Quadruple the cost of fossil fuel via taxes and then use those funds to help the lower 60% or so survive by giving money direct to consumers for food, heating, etc. The markets will rapidly adapt as most tech is there, we just misallocate the hand of government spending.

Realistically since what I proposed above is non-viable? Increase the cost of producing fossil fuels through more direct means, of which discussion is banned on most of the public internet.