, 8 Apr 2005 (UTC) 

 This EROI stuff may be true for some types of energy supply such as biofuels, hydrogen etc, which I think are pure fantasies designed to prevent us from facing hard realities. Even if biofuels were viable, to supply the ammount of liquid fuel we use now with biofuels, would take up most of the worlds farmland, leaving little space for growing food.   

 However I've read that some types of alternative energy eg wind turbines have a positive EROI and produce many times more energy than is invested in them. I belive that even solar panels have a positive EROI ableit a much smaller one.  

 However from what I've heard, I dont believe any of the alternative energy supplies can sustain our economy or way of life as it is now. I think we will probably have to return to localised semi-agrarian economies in the fairly near future, and mass car ownership and economic growth will be things of the past.  19:29