Maybe almost everything we do is not for our survival because using the means given to us by nature we have gone beyond a point where it's all we have to worry about - and all we are able to do. That's quite a bit of conjecture about "animal motivation" versus human motivation btw.
That's the first time I heard of that definition of natural. I suppose you can use it that way, but then the common use makes very little sense, as most natural phenomenons aren't exactly necessary. Unless you're talking about "the necessary logical conclusion of events leading to it", but in that case again technology and human behaviour would be perfectly natural. And of course let's not forget everything necessary isn't necessarily natural. Unless you want to say recycling and the state of law are natural, which I would agree upon, albeit for entirely different reasons.
That's very nice. Until limiting factors reduce our capabilities to sustain such a destructive lifestyle. I see no difference here. Howe do we sustain ourselves past that recalibration? We don't. We are simply able to avoid it, for now. Both by simply not yet overstepping our boundaries and by stepping back if we do (
well that is not working out too well yet - but better than with that hoofed game. I mean we at least manged to reintroduce wolves).
That doesn't change the fact that behaving selfishly out of ignorance to the point of no return (
which also happened in the situation mentioned above) is perfectly normal (
and thus natural by your wishy washy definition that seems more suited to bend the meaning as is fit instead of providing a clear meaning whose merits can be discussed earnestly and that can provide clear direction).
We have urban habitats because our nature is that of a social animal that congregates, while being lucky enough that nature provided us with the means to be able to sustain such huge concentrated populations and gain a competitive advantage out of it. It kind of makes you think of beehives and anthills, doesn't it? I mean the mechanism is the exact same! Only our constructions are technologically a wee bit more advanced and it's obviously on a different physical scale. Aside of that there is no difference between the concept and practise of city-building and the concept and practise of anthill-building. How is one natural yet the other not?
I would suspect only because it is not opportune to deal with the fact that with all the bad things we've done to our dear precious nature, we're still a part of the family of nature. Out of an emotional need to elevate nature, its filthy bastard children are deemed unnatural.