Best explanation ever....
http://euanmearns.com/eroei-for-beginners/
Or, "why I don't think we should hastily stop using coal".
-sgtt
Energy Return on Energy Invested (ERoEI)
Moderator:Metacrock
Prophet Muhammad (God send peace and blessings upon him) is reported to have said, "God says 'I am as My servant thinks I am' " ~ Sahih Al-Bukhari, Vol 9 #502 (Chapter 93, "Oneness of God")