human
I've been hearing a lot about the new "green" technologies. What are they?
assistant
The most common green technologies are solar energy, wind power, and biofuel production. Solar energy is produced when sunlight is converted into electricity or heat. Wind turbines use the wind to produce electricity. Biofuels are made from plant materials such as corn, sugar cane, and vegetable oil. These three technologies are all considered renewable because they can be used again and again without depleting natural resources.