"Delaying mitigation through 2030 will increase the challenges.... and reduce the options," warns a summary of the report. The draft is the third volume in a long-awaited trilogy by the Intergovernmental Panel on Climate Change (IPCC), a Nobel-winning group of scientists.
Major efforts are needed to brake the growth in carbon emissions for a good chance to limit warming to 2 degrees Celsius by 2100, says the summary. "(It) would entail global consumption losses of 1% to 4% in 2030, 2% to 6% in 2050 and 2% to 12% in 2100," the 29-page summary says. These costs do not factor in benefits, such as growth in new areas of the economy, or savings from avoiding some of the worst impacts of climate change.
The estimates are based on the assumption that "all countries of the world" begin curbing carbon emissions immediately and that there are "well-functioning markets" to establish a single global price for carbon. The report looks at options, but makes no recommendations, for mitigating greenhouse gases that are driving the climate-change crisis by trapping solar heat and warming Earth's surface. The final version of the document is due to be thrashed out at a meeting in Berlin in April.
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