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Jeffrey Sachs defines his idea of "the tragedy of commons [land]."
Sachs believes that, if common land is "available to everybody" but "controlled by nobody," the land will be "overused to the point of exhaustion."
Jeffrey Sachs uses the metaphor of driving towards a cliff for the American political climate.
Furthering this analogy, Sachs believes that this cliff might lead to either total global collapse, or, potentially, paradise.
Jeffrey Sachs discusses the problem of reconciling economic development to sustainable living.
Sachs emphasizes environmental influence by saying that "everything that we do in life depends on a healthy, physical environment."
Jeffrey Sachs speculates on the consequences of ignoring global warming and other crises.
While Sachs is optimistic about the future, he believes "we have to step up" education and policy.