Share 'Semi-vegetarianism?'

I'm not sure whether this is the right place to post my questions. Anyway ... I'll try. What are the reasons to become a semi-vegetarian i.e. to abstain from red meat? How can it effect your health, protection of animals and nature? Is it acceptable or just inconsequent? I've browsed multiple websites and noticed that vegetarianism is a very emotional topic. So I'm looking for more impartial fa…