You can form your own opinions about global warming, rising ocean levels, the acidification of the seas, the destruction of our rain forests or the unsustainable nature of our carbon based economy (see peak oil). I don't have time to reference the multitude of articles on the subject, but they're abundantly available... there's this great site called Google.com which can help you with that.

Regarding the issue of 'natural beauty' in the world, I see it on a micro-level when I go to a lake in the summer that was once pristine but is now overrun with seaweed due to Nitrogen runoff from farmer fields. I see it on a macro level when I read about things my children's generation might never enjoy, like the beauty of a coral reef.

At the end of the day with so much 'pseudo science' thrown around from fringe scientists, all anyone has is an 'opinion'. You now have mine.