Roughly 21% of the electricity used in residential and commercial buildings goes to lighting.

Roughly 21% of the electricity used in residential and commercial buildings goes to lighting.

Roughly 21% of the electricity used in residential and commercial buildings goes to lighting.

Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.

Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.

Consuming the largest amount of energy, space heating accounts for 31% of all residential energy used. Space cooling accounts for an additional 12% of energy usage.

In 2008, the U.S. imported about 66% of its oil supply. This percentage is expected to grow even higher over the next two decades.

In 2008, the U.S. imported about 66% of its oil supply. This percentage is expected to grow even higher over the next two decades.

The energy we capture for use on Earth comes largely from the sun or from nuclear forces local to our own planet.

The energy we capture for use on Earth comes largely from the sun or from nuclear forces local to our own planet.

While wind energy has many benefits, all of the above are considered drawbacks to wind energy.

While wind energy has many benefits, all of the above are considered drawbacks to wind energy.

While wind energy has many benefits, all of the above are considered drawbacks to wind energy.

In 2005, a million Btu of energy from coal cost approximately $2, versus $5 for natural gas and $10 for oil. However, prices can fluctuate due to changes in the economy and new government policies.

In 2005, a million Btu of energy from coal cost approximately $2, versus $5 for natural gas and $10 for oil. However, prices can fluctuate due to changes in the economy and new government policies.

Fossil fuels (petroleum, natural gas, and coal) account for 84% of the energy used in the United States.

Fossil fuels (petroleum, natural gas, and coal) account for 84% of the energy used in the United States.

Nearly 80% of France's electricity is produced by nuclear power plants.

Nearly 80% of France's electricity is produced by nuclear power plants.

The United States and Canada are both developed countries. China and India are projected to have the greatest growth in energy consumption between 2006 and 2030.

The United States and Canada are both developed countries. China and India are projected to have the greatest growth in energy consumption between 2006 and 2030.