U.S. Population Hits 300,000,000

The U.S. population is on track to hit 300,000,000 on Tuesday morning, and it's causing a stir among environmentalists.

People in the United States are consuming more than ever: more food, more energy, more natural resources. Open spaces are shrinking and traffic in many areas is dreadful.

About 40 % of U.S. population growth comes from immigration, both legal and illegal. The rest comes from births outnumbering deaths.