Appliances start saving energy as population grows

摘要

The population of earth uses 13.5 TW of energy per year. But if the entire population of the world used energy at the same rate as US citizens, we would need 76 TW (Reference 1). And that's just the beginning. In 2050, when the population reaches a projected 9 billion, we would need 102 TW. There are alternatives, of course.