Passing 350 ppm

1989_Passing 350ppmAtmospheric CO2 concentrations pass 350 ppm, considered to be the “safe” upper limit for carbon dioxide concentrations in the atmosphere. Prior to the Industrial Revolution, the atmosphere contained CO2 levels of about 280 ppm. Today, atmospheric concentrations of CO2 surpass 400 ppm.

World Population : 170,060,000

Key:   1,000,000 People    1,000,000 People (Annotated)    Milestone

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