A temperature increase of 2oC above pre-industrial levels is the
maximum target range established by the scientific community
for stabilizing carbon concentrations at a level that prevents dangerous interference in the climate system. This corresponds to a target greenhouse gas concentration (in terms of carbon dioxide equivalents (CO2e)) of between 350 and 450 parts per million (ppm) and to global emission reductions of the order of 50-80 per cent over 1990 levels, by 2050. These targets cannot be met without a major transformation in the way energy is produced and consumed. The energy sector, broadly defined, accounts for 60 per cent of global emissions and a stable climate will require reduction in the rate of energy intensity and improvement in carbon intensity by a factor of between 2 and 3 with respect to their historical levels.
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/climate-change-and-energy-challenge
[2] http://admin.indiaenvironmentportal.org.in/category/author/et-al
[3] http://admin.indiaenvironmentportal.org.in/category/author/imran-ahmad
[4] http://admin.indiaenvironmentportal.org.in/category/author/tariq-banuri
[5] http://admin.indiaenvironmentportal.org.in/category/author/richard-kozul-wright
[6] http://admin.indiaenvironmentportal.org.in/category/publisher/united-nations
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy-efficiency
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/clean-development-mechanism-cdm
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global