My mother said she never understood why North Americans ate so much meat and junk food. So, growing up we kids had very little of either. She'd say we're not "cavemen" and that just because other people were eating dead animals, didn't mean we had to. She always stressed the importance of eating healthy which included lots of fruit, vegetables, and oatmeal. My dad was concerned about the environment and I loved animals, so for everybody it was a non-issue. Whereas our attitudes weren't the norm back then, they are commonplace now. If somebody suggested that we eat humans, most of us would find it abhorrent, and so, too, future generations may consider today's socially sanctioned and acceptable serial murder of other living creatures truly barbaric.
Bob Hunter, (1941-2005) commented in one of his columns for the Vancouver Sun some years ago that "For all our ideals and morality, those of us who eat meat are undeniably mass killers, even if we hire hit-men to do the job, and others to carve the bodies up, and yet others to transport the chunks around in refrigerated trucks."
Our power over the animal kingdom has been that of a monster. Time to inspire change, and it's really quite simple. It's one individual at a time, leading by example.