Nice post which detail many aspects of veganism. Personally I love vegan food but I think it is not suitable for human species as it is. The importance of meat and fish (especially) is significant, you can imagine a diet without Omega 3 and 6...but surely, an increase of vegan's food in our diet has both a good effect on our health conditions and on the reduction in CO2 emission...I wrote an article about that :o)