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My score is in review to samples #1 and #2.
If I remember correct; Your logo objective had something to do with the company going green. Yes? Even though I don't recognize what your logo could be trying to convey (besides an "N" of course). I like the design, overall.
The slightly off-center ">" in #3 is too much. I feel that you were going for something clean and sharp. #3 almost hits that mark. Just not well enough.

Thanks