Cars are the leading cause of: air pollution water pollution deforestation fossil fuel consumption

The combustion of fossil fuels like coal, petroleum and other factory combustibles is a major cause of air pollution. ... Meanwhile, emissions caused by gasoline-burning vehicles – i.e. CO, CO², nitrogen oxides, particulates and water vapor – are also a significant source of air pollution.

I say Air Pollution

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

hope this !

that scientist would be robert hooke