Why GO GREEN?
Physiology Physiologically, people are more akin to plant-eaters, foragers and grazers, such as monkeys, elephants and cows, than to carnivore such as dogs, tigers and leopards. For example, carnivores do not sweat through their skin; body heat is controlled by rapid breathing and extrusion of the tongue. Vegetarian animals, on the other hand, have sweat pores for heat control and the elimination of impurities. Carnivores must lap liquids but vegetarian animals take liquids in by suction through the teeth.
Dental features Carnivores have long teeth and claws for holding and killing prey; vegetarian animals have short teeth and no claws. The jaws of carnivores only open in an up and down motion; those of vegetarian animals also move sideways for additional kinds of chewing. 
Alimentary canal The alimentary canal of vegetarian animals are 10 to twelve times the length of the body. This permit foods that are less prone to decomposition, a longer time to pass through. Carnivores in contrast, lave a short digestive tract, compare to herbivorous. The digestive tract of carnivorous animals is only three times the size of their body. This enable the carnivorous to eliminate easily decay flesh swiftly because poisonous substances formed from decaying flesh will cause toxification. The saliva of carnivores contains no ptyalin and cannot predigest starches; that of vegetarian animals contains ptyalin for the pre-digestion of starches. Carnivores secrete large quantities of hydrochloric acid (10 times more) to help dissolve bones; vegetarian animals secrete little hydrochloric acid.
Hence, without doubt, the early inhabitant of earth (our early ancestors) were vegetarian. Therefore, whether physiologically, naturally or instinctively, fruits, vegetables, grains, roots, nuts and seeds are most suitable to the human body. You may ask, "How is it that now human consume meat and flesh?" This is a difficult question to answer. An hypothesis is that consumption of meat started with the discovery of fire by man. After a natural caused forest fire, man tasted the burnt (roasted) animals and find them to seems taste better then compared with plant foods. Hence, from that day onwards, man discovered fire and start to hunt animals for food.
Information extracted from http://vegetarianism.danielck.net/why_scientific.htm
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