Coal and gas usage continues to grow on global level
The oil is still the world's most important energy source but the use of coal and natural gas continues to grow in significance, according to new study conducted by the Worldwatch Institute. According to recent numbers the global usage of coal increased 5.4 percent in 2011, to 3.72 billion tons of oil equivalent, while natural gas use grew 2.2 percent, to 2.91 billion tons of oil equivalent.
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