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Cap-and-trade-war
Marginal Revolution — Eric Posner and Paul Krugman defend the use of tariff threats against polluting countries, such as China.  I'll outsource my response to an earlier post by Matt Yglesias: The bottom line about the international aspects of climate change is that the very idea of an effective response assumes the existence of a generally cooperative international environment. It doesn’t assume the non-existence of the odd “rogue” state here or there, but it assumes the absence of any kind of serious great power rivalries. Not just China, but also India and ...

Climate Change Legislation and Protectionism
Economist's View — ... those government-created differences in competitiveness, and there should be no such attempts if a cap-and-trade system is introduced. If an international agreement to impose a cap-and-trade scheme is adopted in Copenhagen, the countries there should agree as well that there will be no attempt to introduce offsetting tariffs that would ultimately threaten our global system of free trade. Paul Krugman on what to do if other countries refuse to participate: Climate, trade, Obama, by Paul Krugman: I think the president has this wrong: ...