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A common goal of world governments is to reduce the anthropogenic effect on the global atmosphere within the next 100 to 200 years. But there may be more than one path to that goal, according to three scientists who offered an alternative to the current timetable recommendations of the Intergovernmental Panel on Climate Change and other United Nations panels.

Current proposals from the IPCC recommend immediate and sizable reductions in carbon-dioxide emissions and a relatively rapid transition away from fossil fuels in order to gradually stabilize atmospheric CO2 concentrations by 2150.