As I am aware, the alternatives under consideration are: a) either to cut anthropogenic CO2 emissions rapidly according to the Paris agreement in order to «transit
away from
fossile fuels», or b) to replace
fossile fuels — in accordance with Eija - Riitta Korhola — by developing methods to replace energy from
fossile fuels still available by using other energy sources available when that is profitable, or when
fossile fuels are finishing.