<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, some of them are better for the environment than gasoline or diesel vehicles. Electric and hydrogen-powered cars produce fewer emissions than traditional internal combustion engines, which is good for the environment. However, there are still a lot of questions around their long term environmental impact, so it's important to consider all the facts before making a decision.