People gather to fetch water from a huge well in the village of Natwarghad in the western Indian state of Gujarat, India, on June 1, 2003. With the world’s population coming in at a few million more than seven billion, resources like food, water, and energy are at a premium. Will there be enough to go around as the citizens of emerging economies begin to live longer and healthier lives? Maybe, maybe not. Consider this fact: While the world’s poorest live on less than two and a half gallons of water per day, the average American consumes 99 gallons of water per day.

Photo: Amit Dave/Reuters