孩子们也参与了环保活动。

The children are also participating in the ___environmental activity.

我们需要更多地关注环境问题。

We need to pay more attention to ___environmental issues.

我们学校最近组织了一次环保活动来种植树木。

Our school recently organized an ___environmental activity to plant trees.

我们需要保护环境，减少环境污染。

We need to protect the ___environment and reduce pollution.