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Well...not $0: https://www.livescience.com/23678-methane-emissions-roman-times.html https://www.livescience.com/23678-methane-emissions-roman-ti... >researche

Well...not $0: https://www.livescience.com/23678-methane-emissions-roman-times.html https://www.livescience.com/23678-methane-emissions-roman-ti... >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.

sergeykish 7y ago
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 https://en.wikipedia.org/wiki/Little_Ice_Age https://en.wikipedia.org/wiki/Little_Ice_Age https://en.wikipedia.org/wiki/Roman_Warm_Period https://en.wikipedia.org/wiki/Roman_Warm_Period