"meant" what do you mean by "meant"? who meant? why did they mean for that? You're not making sense, you're ascribing special properties to manmade enviorns and acting like they're polluted, bad, or different in some essential way. That manmade enviorns are polluted, harmful, or otherwise damaging is just incidental, they don't HAVE to be that way, you cannot just assume that they're innately worse than "natural" enviornments, they're just different. I just want to understand how you think "manmade" is any different from the effort ALL fauna and flora makes to change their enviornment to suit their needs. Is it "natural" the bees build hives? Is it "natural" for beavers to damn creeks? Were trees "meant" to alter the soil chemistry around them to fight off competitors? Did bryophytes defy nature's will by evolving a waxy cuticle to survive in locations untouched by plants before they evolved? Humans, nor any other animal whatsoever was "intended" to live somewhere or some way. This a fundamental error so many people make when talking about the ecology of our planet, there is psuedo-religious way of looking at things and ascribing of anthropocentric values. None of this has a purpose, none of it has a goal, none of it has an intent, or a desire, or any sort of human-like trait.