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Last Week Tonight with John Oliver: Climate Change Debate (HBO)

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This March, Admiral Samuel J. Locklear III, the commander of the United States Pacific Command, told security and foreign policy specialists in Cambridge, Mass., that global climate change was the greatest threat the United States faced — more dangerous than terrorism, Chinese hackers and North Korean nuclear missiles. Upheaval from increased temperatures, rising seas and radical destabilization “is probably the most likely thing that is going to happen…” he said, “that will cripple the security environment, probably more likely than the other scenarios we all often talk about.’’

Locklear’s not alone. Tom Donilon, the national security adviser, said much the same thing in April, speaking to an audience at Columbia’s new Center on Global Energy Policy. James Clapper, director of national intelligence, told the Senate in March that “Extreme weather events (floods, droughts, heat waves) will increasingly disrupt food and energy markets, exacerbating state weakness, forcing human migrations, and triggering riots, civil disobedience, and vandalism.”

On the civilian side, the World Bank’s recent report, “Turn Down the Heat: Climate Extremes, Regional Impacts, and the Case for Resilience,” offers a dire prognosis for the effects of global warming, which climatologists now predict will raise global temperatures by 3.6 degrees Fahrenheit within a generation and 7.2 degrees Fahrenheit within 90 years. Projections from researchers at the University of Hawaii find us dealing with “historically unprecedented” climates as soon as 2047. The climate scientist James Hansen, formerly with NASA, has argued that we face an “apocalyptic” future. This grim view is seconded by researchers worldwide, including Anders Levermann, Paul and Anne Ehrlich, Lonnie Thompson and many, many, many others.

This chorus of Jeremiahs predicts a radically transformed global climate forcing widespread upheaval — not possibly, not potentially, but inevitably. We have passed the point of no return. From the point of view of policy experts, climate scientists and national security officials, the question is no longer whether global warming exists or how we might stop it, but how we are going to deal with it.

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