I give 5 stars even if I see few things that can become better regarding the user feedback mechanism. I find the current system (without metamoderation or ranking) of information entering a little bit limiting. I am afraid that in the long-run it will be a cacophony of useless or contradicting comments. Maybe give a thumbs up-down icon?
Anyway, five out of five because Nokia is giving an extremely useful tool for ecoconscious customers both on their desktop and mobile phone. Nokia is not new regarding its environmentally friendly policies, it's always top in Greenpeace's rankings (http://www.greenpeace.org/international/campaigns/toxics/electronics/how...).
Green Explorer can become a formidable tool if people enrich it wisely and Nokia continues to provide content and articles. There are already many sections where you can find information from Lonely Planet, WWF, and UNESCO. I liked especially the articles from the blog editors.
"Sum Ergo Cogito"