Sprawl, Congestion, and Farmland
The Census Bureau estimates the population of the United States to be 459 million by the year 2050. That's more than a 33% increase over the next 40 years. Experts say the average American needs 1 acre of farmland to produce the food necessary for a sustainable diet. The United States has more than 2 billion acres, but much of the land cannot be farmed. For instance, Alaska has more than 300 million acres under ice. So, unless we can control our population growth by reducing immigration numbers, our sustainability will soon be threatened.