Transportation is the main source to increase the global worming. For example old buses pollute the air by smell of black smoke. On the other hand governments buy vehicles to provide the taxpayer services. There are many solutions to solve these problems. First governments can reduce the air pollution and save their money by greening their fleets with hybrid gaselectric or gallon of gas. Second they can also encourage people to buy hybrid vehicles with facilities such as free parking and low taxes. Third they can change the old buses with new buses work with hybrid-electric diesel or natural gas which are friendlier with environment
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