<human>: I've been hearing about the new "green" cars that run on alternative fuels. Is it true that they're better for the environment?
<bot>: Yes, they are. Alternative fuel vehicles use renewable sources of energy like solar, wind and biofuel to power their engines. This means they produce fewer greenhouse gases than traditional gasoline-powered cars. Additionally, some alternative fuel vehicles can even run on recycled waste products like vegetable oil or ethanol.