You are dealing with people who don't believe in that sort of stuff and will happily misrepresent, distort, and paraphrase whatever numbers and facts you throw at them from whatever source fits their belief system best. People aren't rational. That's 99% of the problem right there. Look no further than the Whitehouse for that in action. Even environmentalists are spending disproportionate amounts of effort on things that fundamentally don't really help a lot. Yes it would be awefully nice if 7 billion people stopped eating meat but you shipping over avocados and quinoa to fuel your vegan lifestyle is probably not helping.