Alex John 2- Recycling and reusing This is stylistically preferred because of the parallel constructions. ") But both can be grammatically correct in the appropriate context.
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Alex John2- Recycling and reusingThis is stylistically preferred because of the parallel constructions. (So is "recycle and reuse.")
Alex John 1- Recycling and reuse2- Recycling and reusingThe Three R's of ecology: Reduce, Reuse and Recycle.
Alex John1- Recycling and reuseWith 'reuse' as the noun, I find this one preferable. The '-ing' nouns are usually second to the extant noun (if it exists) in style.