下文有何错误

on the world(in the world)
from(in) our lives

Pollution is one of the most serious problems in the world. We must do our best to protect our environment. We can do something in our lives. For example, we should pick up litter when we see it on the ground. We should not make a nuisance in public places. In short, we should make our city a beautiful and good place to live in.

污染问题是世界上最为严重的问题。我们必须尽自己最大的力量去保护好环境。然而我们就应该在自己的生活中去做一些事情。比如说，当我们看到地上丢有垃圾的时候，我们应该把它捡起来。在公共场合，我们不应该制造任何的噪音。总而言之，我们应该努力使我们的城市变得更加美丽，让我们有一个更好的居住环境。