We can’t just consume less due to past GHG emissions
Consuming less it not the goal, due to pass GHG emissions that accumulated in the atmosphere and in the oceans and will stay there for centuries.
It’s too late to just consume less hydrocarbon. Instead, we have to completely stop consuming hydrocarbon within this century.
We may even have to find new technologies to remove CO2 from the atmosphere, even if we reach zero GHG emissions in the course of this century.