Preserving biosphere is precious. "Cost to earth" is meaningless by itself - the planet isn't going anywhere. The only fragile thing here is biosphere. I can s

Preserving biosphere is precious. "Cost to earth" is meaningless by itself - the planet isn't going anywhere. The only fragile thing here is biosphere. I can see that you don't actually value Earth, just pity that it's so small you have to ration it.