Natural gas is a fossil fuel, which is a non-renewable energy source.

Renewable energy sources do not produce greenhouse gases, which contribute to climate change.

Driving a car with a large engine is not an example of energy efficiency because it uses more fuel than a car with a smaller engine.

Solar power is the term for the process of generating electricity from sunlight.

Nuclear power plants are not a type of renewable energy technology because they use uranium, which is a non-renewable resource.

The main challenge facing the widespread adoption of renewable energy is the cost of renewable energy technologies.

Energy efficiency can help you reduce your carbon footprint by reducing your energy consumption.

Wind power is the term for the process of generating electricity from the wind.

Coal is a fossil fuel, which is a non-renewable energy source.

Geothermal power is the term for the process of generating electricity from the heat of the Earth.

Driving a car with a large engine is not a type of energy efficiency measure because it uses more fuel than a car with a smaller engine.

Energy-efficient appliances can save you money on your energy bills, help you reduce your carbon footprint, and make your home more comfortable.

Nuclear power is not a renewable energy source because it uses uranium, which is a non-renewable resource.

Hydropower is the term for the process of generating electricity from the movement of water.

Electric cars are not a type of renewable energy technology because they do not generate electricity from renewable sources.