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Furthermore, the second largest source of carbon dioxide producer is petroleum, which emits about three-fourths of carbon dioxide as combustion of coal (Biologicaldiversity.org, 2014). It plays a vital role as the energy sources for global transportation because thousand millions of cars, trucks and motorcycles burn petroleum to operate, and it simultaneously release atmospheric carbon dioxide, which has caused Earth’s temperature to increase. In 2009, 32.8 percent of global energy was supplied by burning petroleum and globally emitted 36.7 percent of carbon dioxide (C2es.org, 2014). Moreover, Natural gas is also contributing to the greenhouse gases emissions, although it releases only half of carbon dioxide comparing to burning coal (Biologicaldiversity.org, 2014). Because of the lower carbon content of natural gas and the higher efficiency, which gas can be generated to electricity, so shifting from coal to gas in electricity conversion will reduce the greenhouse emissions by 50 percent.
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