It really is almost nothing compared to the devastation wrought by Glaciation, and it is far less destruction than that caused by the creation of a city, and that city destroys nature all around it for hundreds of miles, or all over the earth for that matter, pulling in the resources it needs in continuing to exist.
Those tree huggers live in those cities, mindless of the relationship that they share and reliance that they have on what they claim to hate!
Mindless hypocrisy as I see it!!
If you can't grow it .... you have to mine it .... and there truly are not any other forms of resource wealth available to man, in any real economy!!!