An 'ARE YOU SMARTER THAN AL GORE?' energy quiz

5. How much land would be needed to replace all of the world’s current use of fossil fuels with biofuels such as wood, charcoal, ethanol, and biodiesel?

a) 400,000 square miles (equal to the area of France and Spain combined)

b) 4.8 million square miles (equal to the area of the US and India combined)

c) 6 .6 million square miles (equal to the area of Russia)

Previous answer:

What is the biggest expense on your utility bill?

b) heating

The US Department of Energy ranks the expenses on the typical residential utility bill this way:

31 percent - space heating

12 percent - space cooling

12 percent - water heating

11 percent - lighting

9 percent - computers and electronics

9 percent - appliances

8 percent - refrigeration

8 percent - other

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