阅读对话，判断下列句子正误。

Helping Our Planet (星球)

Two students are talking about how they go to school. Joe: Mike, how do you go to school?

Mike: I go to school by car.

Joe: Did you know that using a car is bad for our planet?

Mike: No! I didn't know that. What can I do to help the planet?

Joe: You can go to school by bike.

Mike: What about going to school on foot?

Joe: Yes! Going to school on foot is good for our planet. It is also good exercise!

Mike: Okay, I will start going to school on foot. Let's see if we can get more students from our class to go to school on foot.

Joe: That's a great idea! We will be helping our planet!