The problem is mathematically it just doesn’t work. Humans are too good at reproducing. We’d be back in force before too long.

No, the only way is more death note style, taking out billionaires and some of their bootlicking buddies, and those who put profit over the planet’s health. It’s perfectly possible for the rest of us to patch things up—we almost did it with the ozone. (Until guess who decided they wanted to throw money around to force us to stop.)

If the half of the population includes the part that owns cars perhaps, but the carbon footprint of a person varries greatly. In general the more money someone has the higher the burden they are on the climate.

Idk, I feel like targeting living beings is different than targeting structures, even though I know a sudden lack of refined oil would lead to death. I'm just convinced they'll never stop until their own heat deaths.

They don’t refine oil for people to consume it, they refine oil to generate shareholder value.