What people don't take into account is that human effort is both limited and fungible. Even if we restrict ourselves to only activities that improve health and/or environment, any effort spent on this could have been spent on something else. Is this the BEST way to spend that effort? I don't know, maybe it is. But would it be better spent on recycling, solar power, species protection, cancer research, etc?

I hope someone is trying to do some level of analysis of this so that we don't spend a lot of effort on a tiny problem when there might be larger problems we could be going after.