America's population is on track to hit 300 million on Tuesday morning, and it is 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.
America still has a lot of wide-open spaces, with about 84 people per square mile (2.5 square kilometers), compared with about 300 people per square mile (2.5 square kilometers) in the European Union and almost 900 people per square mile (2.5 square kilometers) in Japan.
But a little more than half the US population is clustered in counties along the coasts, including those along the Gulf of Mexico and the Great Lakes. Also, much of the population is moving away from large cities to the suburbs and beyond.