Answer: Increased carbon emissions
Step-by-step explanation:
Both excepts show that using automobiles is very important in the world and is a very widespread practice. Most automobiles however, run on fossil fuels by combusting the fuels in the engine and then releasing the gaseous by-products a lot of which are carbon based.
With a higher number of cars therefore, there will be an increased amount of carbon emissions into the atmosphere which will contribute to global warming and its adverse effects by extension.