With the increasing density of the world population, air pollution has become a serious problem. Air pollution mainly comes from four major human activities: industry, energy, transportation and agriculture. It takes energy to run factories and power trains, airplanes and buses. Almost all of this energy is generated by burning fuel, which causes air pollution. Scientists are studying new ways to generate electricity that can reduce environmental damage. Enhanced public awareness of environmental protection has led to activities such as recycling.<br>
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