I genuinely don’t understand what you mean. Fertile how? It’s pretty obvious global temperatures are increasing, heat related deaths are more common in areas that previously weren’t an issue. Catastropic environmental events seem to happen every couple months.

You have an article you can share because it sounds like a bad take

I was curious how best to cut down on our usage, if we’d be aggressive, how long we could make our oil last.

From the EPA, seems the like roughly 40% of an oil barrel ends up being used to create gasoline source. The transportation sector accounts to 2/3 of our total oil consumption. In the transportation sector, roughly 54% of energy is used just for passenger cars. source

If everyone in the world stopped driving gasoline cars and switched to a 100% renewable option, we would only cut our oil production by about 36%. That changes the timeline from 50 years to 78 years.

Pretty saddening to think about. Hopefully some technology improvements for oil recycling come around quickly