It is not the first time human activity caused climate change, according to the University College London:
Quote:
Highlights
• Combines multiple methods estimating pre-Columbian population numbers.
• Estimates European arrival in 1492 lead to 56 million deaths by 1600.
• Large population reduction led to reforestation of 55.8 Mha and 7.4 Pg C uptake.
• 1610 atmospheric CO2 drop partly caused by indigenous depopulation of the Americas.
• Humans contributed to Earth System changes before the Industrial Revolution.
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Though in this case it is mainly viruses that caused climate change, even when human activity led to it.
If true (still seems like a big claim to me) this also means the original growth of humanity in prehistoric times up to now also impacted the climate.
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For confirmation go to people just like you.
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