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Ask AP: Geo-engineering, Bernard Madoff's assets

Purposely polluting the upper atmosphere? Reflecting sunlight with giant space mirrors?

These aren't the tactics of a Hollywood supervillain — they're controversial "geo-engineering" ideas that some say would help combat global warming.

Is there any chance they would help?

Curiosity about geo-engineering inspired one of the questions in this edition of "Ask AP," a weekly Q&A column...

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