I am guided in the value of much that is 'green' by enviROI.
Whilst based on a rather less than thrilling hypothetical (I hope) concept, I found this, and the comments provoked... interesting:
The carbon footprint of nuclear war
Junkk.com promotes fun, reward-based e-practices, sharing oodles of info in objective, balanced ways. But we do have personal opinions, too! Hence this slightly ‘off of site, top of mind' blog by Junkk Male Peter. Hopefully still more ‘concerned mates’ than 'do this... or else' nannies, with critiques seen as constructive or of a more eyebrow-twitching ‘Oh, really?!' variety. Little that’s green can be viewed only in black and white.