Hypothetically, switching off the lights for an hour would cut CO2 emissions from power plants around the world. But, even if everyone in the entire world cut all residential lighting, and this translated entirely into CO2 reduction, it would be the equivalent of China pausing its CO2 emissions for less than four minutes. In fact, Earth Hour will cause emissions to increase.
The MPAA & RIAA claim that the internet is stealing billions of dollars worth of their property by sharing copies of files. They're willing to destroy the internet with things like SOPA & PIPA in an attempt to collect that money.
Let's just pay them the money! They've made it very clear that they consider digital copies to be just as valuable as the original. That makes it a lot easier to pay them back in two ways: a. We can email them scanned images of dollar bills instead of bulky paper and b. We don't have to worry about the hassle of shipping huge quantities of cash.