© Eric R. Pianka Despite claims to the contrary, humans cannot live without food and water. One third of Earth's surface is desert which supports very few people. People can visit deserts but long-term survival in desert regions is very tenuous. Cities built in deserts like Los Angeles, Las Vegas, Phoenix, and Tuscon, cannot exist without importing water or pumping groundwater out of deep aquifers. Indeed, they all face serious water shortages. Similarly, humans cannot sustain themselves for very long in mountains, though we often visit these regions on a temporary basis. Humans have occupied almost all of Earth's habitable lands. ![]() ![]() ![]() Divide this figure by the current human population of 7 billion (that's 7,000 million people) and you get 2.3 acres (about one hectare) per person. If all the habitable land on Earth were equally distributed among all human beings present on the planet, this is the per capita share of good land per person. Again, however, we have not allowed for any amenities such as highways, schools, hospitals, shopping malls, stadiums, agricultural fields, rivers, lakes, reservoirs, parks, golf courses, etc. Even so, could you live on 2.3 acres? Efforts have been made to estimate the amount of land needed to sustain an average individual human (link). A person living the profligate lifestyle of an average American requires almost 24 acres, ten times the world per capita share. Bottom Line: For everyone presently on this planet to enjoy the lifestyle of an average American, we would need about ten planet Earths. We have only one. For everyone to live like an American, Earth can only support about one-tenth as many people. To increase the average quality of life, the number of people on Earth must be reduced. Let's Concentrate the World Population Diamond: The Worst Mistake Humans Ever Made |