Some researchers have concluded that global climate change is already occurring and that global warming will increase this century. Recent international negotiations, however, including a 2012 meeting in Doha, Qatar, have yet to reach a global consensus on how to reduce greenhouse gas emissions. Some countries have resisted taking action because there are other researchers who claim that the warming trend may be just a random fluctuation and/or not related to human activity or that cutting CO² emissions? What are the possible costs and benefits of each of these two strategies?
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