human
I've been hearing about the new 'green' energy sources. What are they?
assistant
The most popular green energy sources right now are wind and solar power, as well as biofuel. Wind turbines convert wind energy into electrical power by using a series of blades to spin a generator, while solar panels use photovoltaic cells to convert sunlight into electricity. Biofuel is produced from plant material such as corn or sugarcane, which can be used in vehicles or burned for electricity.