Rapid population growth both in the United States and around the globe consumes precious resources and diminishes biodiversity. Since the first Earth Day in 1970, the global population has more than doubled from 3.7 billion to over 7.7 billion. The current median projection is that the world population will soar to 11 billion by 2100.

In 1970, the population of the United States stood at 203 million. In the half century since then, our population increased to 330 million. Population growth in America is largely driven by mass immigration, with approximately 1 million new immigrants arriving each year. Census projections indicate that the U.S. population will pass 400 million in fewer than 40 years. 

UN Population Division, World Population Prospects
Census Bureau, National Population Projections