"the pressing need for substantial action to limit the magnitude of climate change and to prepare to adapt to its impacts."
Since the effects of greenhouse gases can take decades to come about, and then persist for hundreds or even thousands of years, waiting for impacts to occur before taking action will likely be too late for meaningful mitigation, according to the report.
Beginning emissions reductions soon will also lower the pressure to make steeper and costlier cuts later. "It is our judgment that the most effective strategy is to begin ramping down emissions as soon as possible," said committee chair Albert Carnesale of UCLA. More >>>
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