(4) Short of killing them it is extremely unlikely you will convince the billions of people living in mud huts and shitting in holes they dug themselves to not increase their carbon footprint in order to better their lives. The world, at least in the here and now, simply can not afford or is unwilling to implement (as in lobbing a few hundred nukes) a true solution regardless of how bad the problem may be.
That would be a valid argument if there was no technology that would keep our standard of living at the same rate as today.
Heatpumps, solar, wind, nuclear has more than the needed capacity, you don't need to fuel your car with gasoline today, nor is there ANY reason to use coal or oil at any plant to make electricity.
It's not even more expensive but a LOT CHEAPER in the long run to phase out oil and coal, everyone knows that except the oil producing nations, one of them is the USA.
It really has to take a REAL daft fucker to not realise that releasing a sheitload of CO2 into the atmosphere will have consequences, and i mean someone who is fucked in the head beyond all help or simply someone who rather bets against all knowledge that any man who has ever tended a garden has.