What’s so hard about meat? Just stope eating it! :D
Quite a few people are saying that they are not going vegan because not enough medical professionals are saying that it is safe. Solution: sponsor more research that tries to find out whether it is “safe”, provide more publicity for the results of such research. There’s a lot of anecdotal evidence out there. It’s just a matter of marketing at this point.
Also I think that building a city on Mars might be one of the greatest investments humanity could make. So much cool stuff would trickle down to everyone.