Count the cars on Earth and you’ll eventually reach a number bigger than 500 million! Cars will never outnumber people—there are over 6 billion (6000 million) of us on the planet—but in some places, at least, the numbers are getting close. In the United States, the world’s most car-crazy nation, there are now about 500 cars for every 1000 people.
More from The Green Living Guy:
1. Build Your Own Electric Vehicle by Seth Leitman and Bob Brandt
2. Build Your Own Plug-in Hybrid Electric Vehicle by Seth Leitman
3. Build Your Own Electric Motorcycle by Carl Vogel