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