what are the governments' functions?

China
December 7, 2009 3:00am CST
what are the governments' functions, and through what ways, I mean, by taking what kinds of measures can governments fulfill their missions. for example. to control the polution of the air. governments can issue some laws to limit the production and purchase of private cars.Besides making rules and regulations, what other measures can governments do? please give me some examples,and explain.
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