Page 37, ex. 11

-It's more natural and cleaner to use animals for work and transportation than engines. We should use them more.
-It's wrong to use animals like horses and dogs in sports.
-Modern transport is much better. There's no reason to use animals.
-We still need animals for certain kinds of work.

I agree that using animals for work is cleaner but it's not fair that exploit animals. In my opinion, it's worse because animals are abused and exploited, so I think it's better to use occasionally bicycles as transportation and use the car when necessary.