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Stopping global warming and protecting the earth’s climate is a daunting challenge. To prevent a climate crisis we have to move quickly to transform the ways in which we create and use energy, develop petroleum-free transportation and much more. These changes will not be free; there is always resistance to paying for the first steps along this road. Some think that reaching for more ambitious mitigation targets and quicker reductions in emissions would mean economic disaster. Some economists have become known for advocating only slow and modest responses to climate change, lest the costs of mitigation become too large.