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my chem teacher has talked about how global warming will eventually spark another ice age. our earth experiences an ice age every 11,000 years (apparently, according to her), and she says we're coming close to encountering another one. she says that the global warming will have a certain influence on ocean currents and the jet stream and cause the earth to go into another ice age. (she related her hypothesis to "An Inconvenient Truth" if you've ever seen it)