The general human view is that we are the most important things to have ever lived on Earth... My question is "Why?"
If anything we are the worst thing to have ever lived...
My reason for becoming an all mighty Herbivore was basically - I loved animals. Why should I eat them?
Then once I was a vegetarian I did A LOT of research (You should read: The China Study, Skinny Bitch, anything by Peter Singer,
http://www.veganism.com/books.html).
After being vegetarian for a few years I got back into a load of researching again and... It pretty much made me rethink my diet and lifestyle and adopt a Vegan way of life.
Becoming a vegetarian is one of the greatest gifts you can give to our planet.
I am happy you are considering making the change. Good on you