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In page Stern Review:

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Economists have different views over the cost estimates of climate change mitigation given in the Review. Paul Ekins of King's College London (Treasury Committee, 2008) has said that Stern's central mitigation cost estimate is "reasonable",[1] but economists Robert Mendelsohn[2] and Dieter Helm[3] have commented that the estimate is probably too low. According to Mendelsohn, the Stern Review is far too optimistic about mitigation costs, stating that "[one] of the depressing things about the greenhouse gas problem is that the cost of eliminating it is quite high. We will actually have to sacrifice a great deal to cut emissions dramatically" (Mendelsohn, 2007).[citation needed]