Global warming threatens American security.

Climate change is an urgent national security issue. So says a recent National Intelligence Assessment and an influential group of retired military officers and defense experts at the Center for Naval Analysis, a nonprofit policy analysis group. Left unchecked, they say, global warming will sow political instability and conflict in already-fragile parts of the world, places such as Pakistan, the Middle East and Africa. “We’re a global society now. We can’t isolate ourselves from that kind of thi

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