California Governor Arnold Schwarzenegger has called for a climate summit for cities and regions like the one in Copenhagen, AFP reports. He offered to host it in his state. "The world’s national governments cannot make the progress that is needed on global climate change alone," he said, addressing the assembly gathered at the UN Climate Change Conference. "California has shown that a sub-national government can lead theway to national change, and I urge all of the world leaders here inCopenhagen to liberate the power beneath the national level to help uscreate an environment we can proudly pass down to our children,grandchildren, and beyond." California's energy supply is currently 27 percent green, and that should rise to 45 percent by 2020, according to Schwarzenegger.