<P> Energy consumption in the G20 increased by more than 5% in 2010 after a slight decline of 2009 . In 2009, world energy consumption decreased for the first time in 30 years by 1.1%, or about 130 million tonnes of oil equivalent (Mtoe), as a result of the financial and economic crisis, which reduced world GDP by 0.6% in 2009 . </P> <P> This evolution is the result of two contrasting trends: Energy consumption growth remained vigorous in several developing countries, specifically in Asia (+ 4%). Conversely, in OECD, consumption was severely cut by 4.7% in 2009 and was thus almost down to its 2000 levels . In North America, Europe and the CIS, consumptions shrank by 4.5%, 5% and 8.5% respectively due to the slowdown in economic activity . China became the world's largest energy consumer (18% of the total) since its consumption surged by 8% during 2009 (up from 4% in 2008). Oil remained the largest energy source (33%) despite the fact that its share has been decreasing over time . Coal posted a growing role in the world's energy consumption: in 2009, it accounted for 27% of the total . </P> <P> Most energy is used in the country of origin, since it is cheaper to transport final products than raw materials . In 2008, the share export of the total energy production by fuel was: oil 50% (1,952 / 3,941 Mt), gas 25% (800 / 3,149 bcm) and hard coal 14% (793 / 5,845 Mt). </P> <P> Most of the world's high energy resources are from the conversion of the sun's rays to other energy forms after being incident upon the planet . Some of that energy has been preserved as fossil energy, some is directly or indirectly usable; for example, via solar PV / thermal, wind, hydro - or wave power . The total solar irradiance is measured by satellite to be roughly 1361 watts per square meter (see solar constant), though it fluctuates by about 6.9% during the year due to the Earth's varying distance from the sun . This value, after multiplication by the cross-sectional area intercepted by the Earth, is the total rate of solar energy received by the planet; about half, 89,000 TW, reaches the Earth's surface . </P>

Where does most of earth's energy come from