A tax on meat? It's a shame that government and industry continue to ignore these suggestions given by the UN. Check out this video of footage of the UN's discussions on animal agriculture.
Cowspiracy, The Sustainability Secret. I haven't yet seen this documentary, but it sounds like it'll be another good one! Visit www.cowspiracy.com for more details.
"Americans love hamburgers – we each eat an average of three a week. But what are the hidden costs? It turns out that livestock create about as much greenhouse gas pollution as cars, planes and other forms of transport. They also take a heavy environmental toll on land and water worldwide. How can we reduce our impact? Learn more in this animated short from the Center for Investigative Reporting."
Here's a short comment on the research study conducted by Harvard, entitled 'Red Meat Consumption and Mortality', on March 12th, 2012. This comment is written by Dr. Dean Ornish (http://en.wikipedia.org/wiki/Dean_Ornish), a leading doctor in nutritional health.
Dean Ornish Commentary
Update: Here's another link with a video as well. http://www.care2.com/greenliving/harvards-meat-and-mortality-studies.html