What exactly is eco friendly about shutdown versus suspend where it uses < 1W? Besides, the wear and tear of repeated shutdown/powerup cycles might mean it is a less "eco" friendly option in the end.
I don't think the way you run your laptop has appreciable environmental impact. The damage is in manufacturing and disposal. The best way to be eco friendly is to buy laptops that don't need to be replaced as often.
Assuming grandparent comment is shutting down the computer once or twice a day, it should be fine, I'm pretty sure the hard drive isn't going to fail from that.
What do you mean by this?