Australia’s ratification of the Kyoto Protocol came into force on Tuesday. While the Aussies have the second-highest greenhouse-gas emissions per capita in the developed world, Prime Minister Kevin Rudd waxed optimistic, saying the country is on track to meet its Kyoto-suggested emissions-reduction targets. “From today, Australia officially becomes part of the global solution on climate change, not just part of the global problem,” Rudd announced. Still part of the global problem: the United States, the last industrialized country to hold out on Kyoto.