I think it's up to us to lessen the impact on the environment...and as mining operations get more massive, I foresee solar, wind, and
hydro generation as a necessity.  In fact, that will fast become the most profitable kind of mining operation because you're not only
mining bitcoin, but also electricity, which will mean in the future bitcoin mining operations will probably be closely linked with energy
generation as a matter of necessity.

In this way, I'd say Bitcoin is a hell of a lot greener than oil, and inspires progress in "green" technology, rather than raping our planet
for it.