Xkcd: Earth Temperature Timeline
Xkcd: Earth Temperature Timeline
m.xkcd.com /1732/
I keep this one on hand for discussions with people who say "but the climate has always varied". Rate of change is a thing.
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Another one to give them is amtospheric CO2 over time. I recall one graph in my undergrad where it also had significant anthropological events on it like when the industrial revolution started etc.
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