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Our planet is approaching a critical environmental juncture. Across the globe we continue to deplete the five pools of carbon - soil, wood, coal, oil, and natural gas - at an unsustainable rate. We've burned up half the planet's known reserves of oil - one trillion barrels - in less than a century. When these sources of energy-rich carbon go into severe decline, as they surely will, society will follow.

Former archeologist and Sierra Club activist Courtney White calls this moment the Age of Consequences--a time when the worrying consequences of our environmental actions- or inaction -...