Total anthropogenic greenhouse gas emissions have continued to increase over 1970 to 2010 with larger absolute increases between 2000 and 2010, despite a growing number of climate change mitigation policies. Anthropogenic greenhouse gas emissions in 2010 have reached 49 ± 4.5 GtCO2 eq/yr.3 Emissions of CO2 from fossil fuel combustion and industrial processes contributed about 78% of the total greenhouse gas emissions increase from 1970 to 2010, with a similar percentage contribution for the increase during the period 2000 to 2010 (high confidence) (Figure SPM.2). Globally, economic and population growth continued to be the most important drivers of increases in CO2 emissions from fossil fuel combustion. The contribution of population growth between 2000 and 2010 remained roughly identical to the previous three decades, while the contribution of economic growth has risen sharply. Increased use of coal has reversed the long- standing trend of gradual decarbonization (i.e., reducing the carbon intensity of energy) of the world’s energy supply (high confidence). {1.2.2}