All of the above are emitted by vehicles running on gasoline and diesel fuel.

All of the above are emitted by vehicles running on gasoline and diesel fuel.

All of the above are emitted by vehicles running on gasoline and diesel fuel.

All of the above are emitted by vehicles running on gasoline and diesel fuel.

In 2014, about 38% of harvested corn in the US went to make ethanol and its associated coproducts

In 2014, about 38% of harvested corn in the US went to make ethanol and its associated coproducts

In 2014, about 38% of harvested corn in the US went to make ethanol and its associated coproducts

In 2014, about 38% of harvested corn in the US went to make ethanol and its associated coproducts

In 2014, about 38% of harvested corn in the US went to make ethanol and its associated coproducts

There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.

There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.

There is no silver bullet. Tomorrow’s energy, like today’s, will come from a variety of sources.

Tidal energy is gravitational in origin. Solar energy comes from nuclear reactions in the sun.

Tidal energy is gravitational in origin. Geothermal energy comes from radioactive decay inside the earth.

Tidal energy is gravitational in origin. Solar energy comes from nuclear reactions in the sun, and geothermal energy comes from radioactive decay inside the earth.

A typical incandescent lamp (traditional light bulb) that consumes 60 watts of power produces around 800 lumens. A compact fluorescent lamp emits the same amount of light while using only 13 watts. And an LED lamp consumes only 10 watts to give off the same 800 lumens.

A typical incandescent lamp (traditional light bulb) that consumes 60 watts of power produces around 800 lumens. A compact fluorescent lamp emits the same amount of light while using only 13 watts. And an LED lamp consumes only 10 watts to give off the same 800 lumens.

A typical incandescent lamp (traditional light bulb) that consumes 60 watts of power produces around 800 lumens. A compact fluorescent lamp emits the same amount of light while using only 13 watts. And an LED lamp consumes only 10 watts to give off the same 800 lumens.

Extraction of "tight" oil—light crude oil contained in geological formations of shale or sandstone—accounted for only 12% of total U.S. oil production in 2008. By 2012, it made up 35%, and is predicted to rise to 50% in the near term.

Fuel cells are an efficient way to convert hydrogen to electricity, but the energy is stored in the hydrogen.

School buildings represent 13% of commercial buildings energy use, or about 2.5% of total U.S. energy use (13% × 19%).

School buildings represent 13% of commercial buildings energy use, or about 2.5% of total U.S. energy use (13% × 19%).

School buildings represent 13% of commercial buildings energy use, or about 2.5% of total U.S. energy use (13% × 19%).

All of the above are emitted from coal-fired power plants and can be harmful to our health and the environment.

All of the above are emitted from coal-fired power plants and can be harmful to our health and the environment.

All of the above are emitted from coal-fired power plants and can be harmful to our health and the environment.

All of the above are emitted from coal-fired power plants and can be harmful to our health and the environment.

Fossil fuels represent the largest source of stored solar energy, resulting from the transformation of biomass over millions of years into oil, natural gas and coal. 

Fossil fuels represent the largest source of stored solar energy, resulting from the transformation of biomass over millions of years into oil, natural gas and coal.