Your arguments are good, but it´s not the sustainable living i mean!!
I was thinking about take care of nature, saving resources, climate change and so on...
Not to live that you kids have a good life too, to life that the next generations in general have it
100% sustainable living is impossible due to a little thing we call entropy. That being said, maximizing the sustainability of life on earth pretty much boils down to minimizing our carbon footprint. Protect ecosystems and mother nature, and try to recycle as much as possible.