Ah no it is we are not eating fossil fuel it is used to produce energy if an alternative cheaper source of energy comes up world will start replacing fossil fuels. You will see the effect of this in the next 3-4 years as solar and battery price out fossil fuels for electricity first and 10+ years when they start pricing out fossil fuels for other energy use. Where as global warming I am pessimistic about it I think we have already crossed the point of no return for me solar and cheap electricity would allow humans to survive easier in a warming world.