As new CO2 milestone is reached, climate science and action grow inseparable » The view from Mauna Loa Observatory in Hawaii, where atmospheric research has been conducted since the 1950s. (Waging Nonviolence/Bryan Farrell)

The view from Mauna Loa Observatory in Hawaii, where atmospheric research has been conducted since the 1950s. (Waging Nonviolence/Bryan Farrell)

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