@Abyss108: I'm going to try to relate this to the game and the thread because we're way off track.
Ancient elven civilization was like our modern one... they manipulated the natural environment without consideration. However, for the ancient elves... they finally reached a tipping point (according to Solas) - when they started killing the Pillars of the Earth.
That their civilization collapsed was a good thing for the sake of all of Thedas.
Now, we don't know if ALL the Evanuris were part of this... or just Mythal (we can only confirm that she killed one I believe).
It isn't about the act or whether it's "natural" - you're using natural as a substitute for "right" while I'm using it as a substitute for sustainable.
Mining Titans? Unsustainable.
Creating the Veil? Well - we don't know anything about the world before or whether Solas really created it. We do know that afterward it did not inhibit life to continue in any way - and we're told that destroying it will cause calamity. Did it cause spirits to be severed and seek to possess people? Did it cause most everyone to lose magic? We simply cannot know.
Let's look at slavery - also unsustainable. Sapient populations cannot be indefinitely controlled in such a fashion. At least as far as the only sapient population we can study shows (that would be humans). This has required real humans to come up with increasingly ingenious ways to enslave their populations without their populations considering it slavery (example: the debt slavery culture of first world nations).
So... we know that the Evanuris were practicing increasingly unsustainable (and to me, unnatural) acts. Disaster was inevitable for them.
All I see with Solas is someone from that time still thinking in the same way and looking to do more damage to the world through his "unnatural" thinking.
@sim-ran: Calm down cause-head... I wasn't talking about "God" or "intelligent design".
EDIT:
wright1978: Climate change and the sixth extinction event don't care how we feel about what we've done.
I'd like a fairy tale world where humans learn to live sustainably as well - but I know that for what it is.