Of all the offbeat ideas for avoiding global warming, the worst one is to ignore it. Current atmospheric carbon levels have increased by as much as 35 percent since the age of industrialization. Emissions of carbon dioxide by human activities are today more than 130 times greater than the quantity emitted by volcanoes, amounting to about 27 billion tons per year. If people continue to bury their heads in the sand, it may not be long before some of the outlandish geo-engineering solutions raised in this gallery become necessary.
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