The amount of CO2 yet to be released depends on the amount of fossil fuel yet to be extracted. Current oil discoveries, wells, and coal mines will all be exploi

The amount of CO2 yet to be released depends on the amount of fossil fuel yet to be extracted. Current oil discoveries, wells, and coal mines will all be exploited as long as they are profitable. It will be necessary to lower demand for fossil fuel enough that new prospecting becomes unprofitable. This will happen eventually due to the physics of oil drilling. If you consider the amount of energy contributed to the world economy from fossil fuels, there is no clear path how to market alternatives in quantities that can make fossil fuels obsolete. A more realistic scenario for around 2050 is that coal-power increases while oil for personal transportation is replaced by batteries due to high oil price.