Every year in the world there are many meteorological phenomenons, and these phenomenons destroy whatever they have in their way. I'm talking about hurricanes, tornadoes, thunderstorms, and earthquakes which are the main causes of disasters. All of these phenomenons have been increasing and have been destroying many homes and killing people everywhere around the world.
             One of the biggest dilemmas that the earth is experiencing is global warming. Global warming is a threat that will change our lives and the whole world if nothing is done to prevent the serious effects. It is getting worse every year with the irresponsibility of the many fabrics that cause air pollution. Also, excessive deforestation and the burning of coal, oil, and gas have caused an increase in carbon dioxide. Despite the fact that weather is changing, causing global warming, some skeptics think that there is no proof to believe that owing to man-made emissions of greenhouse gases, the climate on earth is changing.
             The main cause of global warming is carbon dioxide emissions. These emissions come from different sources. Some of them come from dioxide from coal, natural gas, and oil. According to the article in eco bridge "coal emits around 1.7 times as much as carbon per unit of energy when burned as does natural gas and 1.25 times as much as oil." The article also states that "twenty percent of U.S. carbon dioxide emissions come from the burning of gasoline in internal-combustion engines of cars and light trucks and about another 13 percent of U.S. carbon dioxide emissions come from trucks used for commercial purposes". This means that if we could make good use of every gallon, we could save millions of barrels of oil a day, and in this way moderate the pollution.
             In 1996, according to an annual study by traffic engineers (as reported in the San Francisco Chronicle of December 10, 1996) from Texas A and M University, it was found that drivers in Los Angeles...