Though 'friendly' ends with 'ly', it is not an adverb. Rather, it is an adjective, as in 'Cable cars are friendly.' When you want to describe an adjective, you use an adverb. For example, take the adjective 'red'. We want to say that an apple has a 'strong' red color. So we say, 'The apple is strongly red.' Note how 'strongly' is an adverb.
So in your case, the correct sentence would be 'Cable cars are environmentally friendly.' (But in Indian English, it is idiomatic usage to say 'Cable cars are environment-friendly'.)
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