We'll need to cut about 50% of fossil fuel demand globally in the next 30 years (see eg https://www.iea.org/reports/net-zero-by-2050 https://www.iea.org/reports

We'll need to cut about 50% of fossil fuel demand globally in the next 30 years (see eg https://www.iea.org/reports/net-zero-by-2050 https://www.iea.org/reports/net-zero-by-2050 ). It will probably happen by tax and emissions trading mechanisms (and elimintating subsisidies ) sufficiently to reduce demand to this level.