Twenty-four hours, seven continents, 150 bands and 2 billion viewers. Global warming is a big problem that needs big solutions. Live Earth was the big concert intended to raise awareness. But is pop music really a solution? Skeptics doubt it. Said one: "Everybody's known about that problem for years. ... I would only organize this if I could get onstage and announce concrete environmental measures from the American presidential candidates, Congress or major corporations. They haven't got those guarantees. So it's just an enormous pop concert." The source of that quote: Bob Geldof, organizer of Live Aid and Live 8....