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Emissions scenarios , estimates of changes in future emission levels of greenhouse gases, have been projected that depend upon uncertain economic, sociological , technological , and natural developments.  In most scenarios, emissions continue to rise over the century, while in a few, emissions are reduced.   Fossil fuel reserves are abundant, and will not limit carbon emissions in the 21st century.  Emission scenarios, combined with modelling of the carbon cycle , have been used to produce estimates of how atmospheric concentrations of greenhouse gases might change in the future. Using the six IPCC SRES "marker" scenarios, models suggest that by the year 2100, the atmospheric concentration of CO 2 could range between 541 and 970 ppm.  This is 90–250% above the concentration in the year 1750.
Some critics of the scientific consensus on global warming have argued that these issues should not be linked and that reference to them constitutes an unjustified ad hominem attack.  Political scientist Roger Pielke, Jr. , responding to Mooney, has argued that science is inevitably intertwined with politics. 
Need to finish my Spanish essay but I would much rather prefer just to lay in bed and watch Magician Dynamo! #lazy
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