When I was taking Environmental Science a couple years ago, our teacher showed us this music video for Sarah McLachlan's song "World on Fire". Which you should watch too.
I should first point out that I have no objection to the music industry. Or the movie industry, for that matter. But its easy to forget how much money is involved in something as simple as making a music video: and what kind of a difference it can make elsewhere in the world, if it's in the right hands.
And thanks to this video, I can't watch any of Lady Gaga's music videos without thinking of the colossal waste of money that went into making them.