You must select your [?] so that people can recycle it

The [?] is in danger in our sky, that's why people get more skin cancers

We must use [?] like the sun or the wind to replace petrol for our energy

When oil or fuel [?] out of a boat, it can cause an oil spill

Cars are dangerous for the environment because they produce [?], which turn into [?] and cause the [?], so the Earth is warmer and warmer

We must protect the animals on our planet, particularly [?]

It's better to burn out waste than put it in an open-air [?]

You must put [?] petrol in your car

You must take care of your environment, you mustn't [?] it