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This is something I’ve been aware of since reading Charles Mann’s 1493 - an impressive book about the clash of civilizations after the discovery of the new world.
A new paper out gives further evidence to the theory that the massive death and disruption of human populations in the new world following encounters with Europeans in the early 1500s triggered a massive regrowth of vegetation and a subsequent drop in CO2 levels. This drop actually triggered the so called ‘Little Ice Age’ of the late 1600-1700s.
The open access paper is here:
Earth system impacts of the European arrival and Great Dying in the Americas after 1492 - ScienceDirect
A solid BBC writeup on it is here:
America colonisation ?cooled Earth's climate? - BBC News
Charles Mann actually tweeted about it here:
Twitter
I dont think this has taken into account another possible major impact of colonization... that is that there’s good archeological evidence that native Americans cleared huge swaths of land by fire. With a massive population drop, reforestation would recur and CO2 production would drop, causing further impacts on CO2 concentrations.
Note that temperature drop (0.3 degrees C) and the CO2 drop (10-15 ppm) is minuscule compared to what the temp rise and CO2 rise is today... we are increasing CO2 by about 3ppm per year, which is 30x the rate of the 1500s.
But its interesting to see an anthropogenic effect from 500 years ago.
A new paper out gives further evidence to the theory that the massive death and disruption of human populations in the new world following encounters with Europeans in the early 1500s triggered a massive regrowth of vegetation and a subsequent drop in CO2 levels. This drop actually triggered the so called ‘Little Ice Age’ of the late 1600-1700s.
The open access paper is here:
Earth system impacts of the European arrival and Great Dying in the Americas after 1492 - ScienceDirect
A solid BBC writeup on it is here:
America colonisation ?cooled Earth's climate? - BBC News
Charles Mann actually tweeted about it here:
I dont think this has taken into account another possible major impact of colonization... that is that there’s good archeological evidence that native Americans cleared huge swaths of land by fire. With a massive population drop, reforestation would recur and CO2 production would drop, causing further impacts on CO2 concentrations.
Note that temperature drop (0.3 degrees C) and the CO2 drop (10-15 ppm) is minuscule compared to what the temp rise and CO2 rise is today... we are increasing CO2 by about 3ppm per year, which is 30x the rate of the 1500s.
But its interesting to see an anthropogenic effect from 500 years ago.