BOSTON (Reuters) - Climate change could be slowed by burying greenhouse gases blamed for global warming deep below the ocean floor under thick, cold sediment that would trap it for thousands of years, said a team of Harvard-led scientists. The seafloor along the U.S. east and west coast is vast enough to store almost unlimited carbon dioxide emissions from U.S. coal-fired plants, said Daniel Schrag, director of Harvard's Center for the Environment. "It would make coal a green fuel," he said in a telephone interview with Reuters. Carbon dioxide released by burning fossil fuels is the main gas blamed for...