Yes and no. While there are some concerned over the pollution there they largely use them because of the cost of owning a car and parking it in the cities.
I'm not sure which ones help stop pollution but i do know that humans are not helping.
you smell ;)
Stop driving high fuel powered cars, ride more bikes, carpool, don't litter. Lots of things.
Most likely they will just move the pollution elsewhere.
Stop pollution, help procure land for wildlife for future generations.
yes, china is only country who stop population.
they are important because they help the environmet and stop pollution.
ldk help me maybe by stopping pollution etc.
you can help out by not driving your car as much, and lowering your heating and such
we can stop this pollution by throwing booms.
you can stop land pollution by recycling.
Well we can stop it by recyling and ridiing bikes to school work. If we all do our part we can help.