Reuters: Climate negotiators warned on Wednesday they may miss the opportunity to cap emissions from shipping and aviation and so miss out on billions of dollars in taxation to help poor countries cope with climate change. With just two days left to reach a new U.N. climate change deal, negotiators say they are still a long way from agreeing targets for shipping and aviation, which together produce as much as 8 percent of the world’s climate-warming emissions. Japan, Saudi Arabia, China …