Their ecological value is in doubt, at best, but by also having helped to let food prices explode, they lead to the question if filling up our car's tanks can justify to make it impossible for people inpoor nations to fill their stomach. It already leads to violence and turmoil in some countries right now.
Not to mention that food prices in our own nations also have drastically raised over the past 12 months - and new massive raises are already announced.
If your money is limited, you can feel it even in our rich Western nations that life has become - hm, let's say it became more difficult.
http://www.guardian.co.uk/business/2...nk.fooddrinks1