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I am not sure if there's an adjective for it. I know people use the word "green", but "green" doesn't necessarily mean that it doesn't emit CO2 or cause pollution.

For example:

The green electric car burned and crashed down the road, but the green flying saucer flew by.

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    Try inert or harmless, or eco-friendly. – LawrenceC Apr 3 at 23:54
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Would carbon neutral do it?

It might.

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"Environmentally Friendly" is a phrase that might be used. Certainly it could be applied to whatever the speaker considered free of harmful environmental effects.

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