Nowadays, certain companies have to pay ..... taxes that are imposed when greenhouse gases are emitted into the atmosphere.

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Nowadays, certain companies have to pay ..... taxes that are imposed when greenhouse gases are emitted into the atmosphere. (*) oxygen (*) smoke (*) fume (*) carbon

This is a companion discussion topic for the original entry at https://english.best/questions/22470,nowadays-certain-companies-have-to-pay-___-taxes-that-are-imposed-when-greenhouse-gases-are-emitted-into-the-atmosphere/