One billion cars, trucks and buses registered throughout the world drove over those roads in 2010, according to auto industry analyst Ward's.
Naturally, we put those roads to good use. One billion cars, trucks and buses registered throughout the world drove over those roads in 2010, according to auto industry analyst Ward's. Unfortunately, each of these vehicles produces pollution. For instance, the average passenger car in the United States generates the following pollutants and emissions annually, according to the U.S. Environmental Protection Agency: