No. The largest source of carbon dioxide worldwide is the combustion of fossil fuels which does include cars but also includes many other sources like power plants, industrial facilities, and coal. While automobiles certainly play a role in causing climate change they are not the only culprit.
No. Like haydenseder said, cars are only one contributing component to climate change. In fact, according to the EPA, electricity generation created the most greenhouse gas emission in 2009, in terms of industry. Transportation was second, and accounted for about 30% of greenhouse gas emissions for that year. This is obviously a substantial amount, but by no means significant enough to account for climate change in its entirety.
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