Climate change reducing greenhouse gases

Secondly, rising concerns about climate change prescribe to reduce greenhouse gas emissions so as to not exceed a concentration of 450 ppm of C02 in the atmosphere which is believed to correspond to a global temperature increase of 2°C. How to curb C02 emissions that currently grow at a rate of 2%/year to the point of making them decrease from the mid-2010s onwards ... 

Greene, D.L. Schafer, A. Reducing Greenhouse Gas Emissions from US. Transportation, Pew Center on Global Climate Change Arlington, VA, 2003 1-80. 

Climate Change (UNFCCC). At the time, the Earth Summit was the largest-ever gathering of Heads of State. Effective on March 21, 1994, the UNFCCC called on industrial nations to voluntarily reduce greenhouse gas emissions to 1990 levels by the year 2000. 

A secondary benefit is that efficiency gains in fossil fuel generation also reduce all types of harmful emissions, even carbon dioxide—the greenhouse gas suspected by many as a major culprit of climate change. A 45 percent efficient plant releases approximately 40 percent less COn per megawatt-hours of electricity produced than a 25 percent efficient plant that it might be replacing. 

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