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Oil 37%, Coal 25% and Gas 23% — are fuels formed by natural resources such as anaerobic decomposition of buried dead organisms. Biomass 4% — is biological material derived from living, or recently living organisms, such as wood, waste, and alcohol fuels. Hydro 3% — is power that is derived from the force or energy of moving water, which may be harnessed for useful purposes. Solar Thermal 0.5% — is used for water heating, space heating, space cooling and process heat generation. Wind 0.3% — is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity, wind mills for mechanical power, wind pumps for pumping water or drainage, or sails to propel ships. Solar Photovoltaic (PV) 0.02% — are arrays of cells containing a material that converts solar radiation into direct current electricity. Energy Intensity The amount of energy required to produce a unit of gross domestic product and is partially related to a country’s economic efficiency. Gross Domestic Product A statistical measure of “the total value of the goods and services produced by the residents of a nation” less the “value of net income earned abroad.” This is usually the measurement cited to describe the size of a nation’s economy. Global energy consumption has increased steadily for much of the twentieth century, particularly since 1950.
One of the most notable developments in recent years has been the explosion of growth in energy demand from Asia, which eclipsed North America for the first time in 2003 as the world’s most energy hungry region. With respect to oil, for example, China’s share of global consumption is only approximately 9.6 percent (est.

According to a China Daily article, China’s demand for fuel is expected to increase by 100 percent by the year 2020.
With that said, per capita figures reveal important variations in the consumption habits of different societies. Energy intensity is a measurement of the amount of energy required to produce a unit of gross domestic product (GDP). Energy efficiency gains are also correlated to structural change in the economies of many developed countries that have transformed from producers of goods to providers of services.
This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. Bioethanol is an alcohol made by fermenting the sugar components of plant materials and it is made mostly from sugar and starch crops. Per capita energy consumption, for example, is the amount of energy that is used on average by each person in a given country. High intensity indicates that a significant amount of energy is required to produce each unit of gross domestic product. One barrel of crude oil is equivalent to 5.8 million BTU, while 1 gallon of gasoline is equivalent to about 124,000 BTU.
In 2008, the world consumed 11294.9 million tonnes (Mtoe) of oil in total energy (including hydroelectric and nuclear power). Others, such as per capita energy consumption and energy intensity, offer more nuanced information about differences among countries.

Electric utility reactors heat water to produce steam, which is then used to generate electricity. For example, forest residues (such as dead trees, branches and tree stumps), yard clippings and wood chips may be used as biomass. Solar water heating systems are generally composed of solar thermal collectors, a fluid system to move the heat from the collector to its point of usage. That amount corresponds to over 82 billion barrels of crude oil burned in 2007. 1 2009 saw the first energy consumption decline since 1982, presumably due to the global recession. Per capita energy consumption has remained relatively stable since 1980 both worldwide and in the United States.11 This indicates that, although the world’s total consumption has increased, most individuals in most countries use about the same amount of energy they did 20 years ago. It shows that the economic efficiency of energy usage has improved or remained comparable throughout the world over the last two decades.
However, biomass also includes plant or animal matter used for production of fibers or chemicals.
From this, we learn that much of the increase in total demand can therefore be attributed to population growth and social transformation—e.g.
In 1980, 15,000 British thermal units Btu) of energy were needed for every dollar of GDP produced in the United States, compared with just under 9,000 Btu in 2006, a 40 percent improvement.13 Most countries, including China, have experienced similar gains in efficiency due to advances in technology and more sophisticated business management practices.

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