This Day in People's History

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An “Earth ball” at a rally in Istanbul, Turkey, with the figure 350 — signifying the safe upper limit in parts per million of CO2 in the atmosphere.

Oct. 24, 2009: International Climate Day of Action

In the lead-up to an international conference on climate change in Copenhagen, climate activists organized a “day of action,” where millions of people gathered at thousands of events all over the world, demanding that governments and corporations work to slash CO2 emissions and enforce environmental protections.
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