Ahead of COP26 climate summit, ship operators contend with limited supplies of cleaner fuel choices and hefty prices for new power modesShipping operators are under pressure from governments and big customers such as Amazon. com Inc.to clean up vessels’ carbon emissions.... The commitment came days before the 2021 U.N. Climate Change Conference, also called COP26, that begins Sunday in Glasgow, Scotland.... The group has said that it could adopt earlier deadlines and more stringent emissions c