Kinda busy so I just googled it. This was pretty quick.
7 Evidence-Based Health Reasons to Eat Meat
Should Humans Eat Meat? [Excerpt] - Scientific American
And this last one is mostly an opinion piece but it is from a vegetarian source so I found it interesting.
Why You Should Eat Meat: A Vegetarian's Perspective | Punchnels
These are just some quick searches.
100 Scientific Reasons to NOT Eat Meat
I know the site may not be authoritative, but these guys gave links for all their reasons.
Position of the American Dietetic Association: vegetarian diets. - PubMed - NCBI
Do Vegetarians Live Longer?
"A 1% reduction in world-wide meat intake has the same benefit as a three trillion-dollar investment in solar energy." ~ Chris Mentzel, CEO of Clean Energy
If every American skipped one meal of chicken per week and substituted vegetables and grains... the carbon dioxide savings would be the same as taking more than half a million cars off of U.S. roads. Environmental Defense Fund
Consumption of meat and dairy and lymphoma risk in the European Pro... - PubMed - NCBI
How Tumors Use Meat to Grow: Xeno-Autoantibodies | NutritionFacts.org
Besides, I've seen way too many studies from Harvard and other Health Associations to believe that meat is healthier than vegetarianism. But that's just me.