Voice of San Diego: Scientists admit they've been frustrated. They've known about global warming since the late 1980s. They've written hundreds of papers about its causes. Humankind is burning fossil fuels, producing greenhouse gases that trap more of the sun's energy. And they've detailed its effects and implications: Warmer oceans. Higher sea levels. Stronger hurricanes. Skinnier polar bears. More common heat waves. The rest of us haven't quite gotten it. A powerful minority of scientists --
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