Energy Sources and Their Carbon Footprint Quiz

Which energy source has the lowest total life cycle emissions per kilowatt-hour?

• Wind (renewable)

• Natural gas (nonrenewable)

• Coal (nonrenewable)

• Oil (nonrenewable)

During which phase of its life cycle does nuclear energy emit the most greenhouse gases?

• One-time downstream

• Ongoing noncombustion

• Ongoing combustion

• One-time upstream

Which renewable energy source emits the most greenhouse gases during its one-time upstream phase?

• Photovoltaic

• Geothermal

• Concentrating solar power

• Hydropower

Which nonrenewable energy source emits the least greenhouse gases during its ongoing combustion phase?

• Natural gas

• Oil

• Coal

• Nuclear

Which renewable energy source emits the most greenhouse gases during its ongoing noncombustion phase?

• Hydropower

• Geothermal

• Concentrating solar power

• Wind

Which energy source emits the most greenhouse gases during its ongoing combustion phase?

• Geothermal

• Wind

• Hydropower

• Concentrating solar power

Which renewable energy source has the highest total life cycle emissions per kilowatt-hour?

• Wind

• Geothermal

• Hydropower

• Concentrating solar power

Which nonrenewable energy source emits the most greenhouse gases during its one-time upstream phase?

• Natural gas

• Oil

• Coal

• Nuclear

Which renewable energy source emits the least greenhouse gases during its one-time downstream phase?

• Concentrating solar power

• Hydropower

• Geothermal

• Wind

Which nonrenewable energy source has the highest total life cycle emissions per kilowatt-hour?

• Oil

• Natural gas

• Coal

• Nuclear