Washington Post: In March of last year, the World Wildlife Fund in Australia teamed up with Leo Burnett, the multinational advertising agency that created the Marlboro Man, to come up with a new environmental campaign called Earth Hour. The idea was to get 2 million residents in Sydney to turn off all the lights in their homes for one hour. The campaign generated wide publicity, but the energy saved was small — the equivalent of taking about five cars off the city’s roads for a year. This year, Earth …