To me the whole Earth Hour idea is symbolically a catastrophe, and today this reminded me of a post in Cafe Hayek on the subject. Here's a key excerpt from a letter written to WWF:
Do read the whole thing.
You and members of your organization worry that industrialization and economic growth are harming the earth's environment. I worry that the intensifying hysteria about the state of the environment - and that the resulting hostility to economic growth - might harm humankind's prospects for comfortable, healthy, enjoyable, and long lives.
So I commend you on your "Earth Hour" effort. Persuading people across the globe to turn off lights for one hour supplies the perfect symbol for modern environmentalism: a collective effort to return humankind to the dark ages.