Doing so converts most of it into carbon dioxide, which is a less powerful greenhouse gas than methane.Only about 20 percent of sewage plants in the U.S. big enough to host such a system do anything other than flaring off the gas, said Kurt Sorschak, chief executive of Xebec, the Canadian company that made the purifying system.Page:12??? -CommentsBe relevant, respectful, honest, discreet and respo