Switzerland's largest city, Zurich, has set a radical goal to reduce the amount of energy its residents use by two thirds - becoming a 2000 watt society.
If you take all the energy being consumed on earth and divide by the number of people, it works out to about 2000 watts per person.
But how many of us are using more than our share?
Can each member of a modern Swiss family really live on the same energy it takes to power 20 light bulbs?
CBS investigates.