A Picture on Earth Day

Earth Day 2019 v2
Plot of historical and possible future atmospheric CO2 concentration. Green: ice core data. Blue: direct atmospheric measurements at Mauna Loa observatory. Dark red dashed projection: future scenario, involving achievement of net zero greenhouse gas emissions by 2040, that would result in projected warming of about 1.5 °C by 2100. Purple dashed projection: future scenario, involving achievement of net zero greenhouse gas emissions by 2055, that would result in projected warming of about 2 °C by 2100. For the implications of achieving (or failing to achieve) these climate goals, see here. Inset: Earthrise, an iconic photograph of our Earth taken from lunar orbit by Apollo 8 astronauts just a little over a year before the first Earth Day.

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