Four days into COP27, the latest global effort to save the planet, and there's modest but discernible momentum toward having richer countries pay some of the bills for climate damage. "I believe that we need to have an open and frank conversation about loss and damage, which countries like Canada and many developed nations have refused to do so far," said Steven Guilbeault, Canada's minister of Environment and Climate Change, in an interview at Canada's pavilion at the summit venue in Sharm el-Sheikh, Egypt. With Prime Minister Justin Trudeau skipping COP27 to focus on other events in Asia, Guilbeault is…