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what gase causes asthma and cancer
hydrocarbon
what contributes to global warming
carbondioxide
what causes traffic
humans
how many cars are excpected to add on in 2050
1.2billion
what causes traffic on highways
uneccercery braking
why are self drive cars better than nomal cars
they can maintain steady distance and speed
what gasas emmited from car
soot carbon monoxide carbon dioxide sulfur dioxide
how many way do city use to limit cars use
4
