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Sure, but the study places the "pivot point" much back in time in the 7,000 to 5,000 years ago range (probably give or take a thousand years): >"I noticed that
by jaclaz 8y ago
Sure, but the study places the "pivot point" much back in time in the 7,000 to 5,000 years ago range (probably give or take a thousand years):
>"I noticed that methane concentrations started decreasing about 10,000 years ago and then reversed direction 5,000 years ago and I also noted that carbon dioxide also started decreasing around 10,000 years ago and then reversed direction about 7,000 years ago," says Ruddiman. "It alerted me that there was something strange about this interglaciation ... the only explanation I could come up with is early agriculture, which put greenhouse gases into the atmosphere and that was the start of it all."
- paganel 8y agoYeah, I had noticed that, too. To give a totally unsubstantiated opinion (i.e. mine) I'd say that that only helps make the case for the massive deforestation happening as soon as the Neolithic Revolution got under way in earnest, starting about 5,000 BCE, that would explain the rise in CO2 concentration (also see the Cucuteni–Trypillia culture - https://en.wikipedia.org/wiki/Cucuteni%E2%80%93Trypillia_culture https://en.wikipedia.org/wiki/Cucuteni%E2%80%93Trypillia_cul...). The rise in methane concentration which happened 2,000 years after that might be explained by people raising a lot more cows around 3,000 BCE (the start of "civilization" on the Nile and Euphrates, for example).