Today, the Kyoto Protocol will reach the fifth anniversary of its entry into force. But John Christy says that new research is casting doubt on claims that the earth is warming. Some even suggest the world may not be warming much at all. The temperature records cannot be relied on as indicators of global change, he said. He is a professor of atmospheric science at the University of Alabama in Huntsville, a former lead author on the Intergovernmental Panel on Climate Change (IPCC).