The thing is, I'm not arguing against the fact (yes, the fact) that doing this would beneficial. I'm saying that stating how "simple" and "reasonable" are these actions is missing the point.
Again, not a personal attack, but do you follow all of these actions (I could add more similar ones)? Do you own or use a car? Have you ever taken a flight? Went on a cruise? Ate cashews or almond milk? If so, why are you doing this? Why are you (to use the terms stated by OP), so unreasonable, unwilling to do so simple things for your children?
I'm not saying that any action is futile, but that the cost (monetary or otherwise) to take them is _vastly_ underestimated and basically swept under the rug with arguments of reasonableness and simplicity.
And, just to restate, I am not defending my own lifestyle, it's not an emotional argument to make for me.