And if you want to be really persnickety... let's see how much money it would take to get CO2 levels down to Roman times! It would cost $0 in Roman Times, and trillions now, so ... they were all rich?
>researchers found that methane production was high around 100 B.C., during the heyday of the Roman civilization, and waned around A.D. 200 as the empire faltered. The methane was released when Romans burned down forest to clear land for crops and expanding settlements, Sapart said.
Yep! These were Little Ice Age prevention measures, or maybe Roman Warm Period investments.
Still expenses. State should have been involved, economic incentives, campaigns like "Burn the coal - stay Huns home" Everyone knew it, but then as now too little to late
