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The biggest climate talks in history opened on Monday with a stark U.N. warning of the risk of desertification and rising seas and an assurance by hosts Denmark that a deal to combat climate change was "within reach".

"Just as climate talks hit their lowest point, Hillary Clinton descended on Copenhagen like a deus ex machina, putting on the table $100 billion in climate aid for developing nations per year through 2020, provided that a deal can be reached with China over making its climate change efforts more transparent. "

As the world weighs how to deal with warming, the idea of human manipulation of climate systems is gaining attention.  Yet beyond the environmental and technical questions looms a more practical issue: How could governments really commit to supervising geoengineering schemes for centuries?

"Despite anger from developing countries over the leaked document, the negotiations are still on track for success."