Energy is extremely valuable as it keeps us warm, grows our food, builds structures, provides light, and transports us globally. Developed nations now use enormous amounts of energy and pay little for it, ignoring environmental costs like climate change. The human body continuously uses about 100 watts of power, or 2.4 kilowatt-hours per day from food. However, with fossil fuels, the average person worldwide now consumes 2,000 watts continuously, 20 times their physical needs. Americans consume six times more at 120 times their physical needs due to technologies like air conditioning and transportation.