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9 not-so-crazy ideas to combat climate change

Man-made volcanoes

Photo: NASA

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Create man-made volcanoes

The controversial book SuperFreakonomics has proposed one of the most outlandish ideas of all. It suggests mimicking the ash-spewing, atmospheric cooling effects of massive volcanic eruptions by attaching several miles of garden hose to a helium balloon and pumping sulfur dioxide into the upper atmosphere. The sulfur dioxide has the power to essentially block sunlight, thus cooling down the planet.