Reuters: Trading Emissions Plc (TREM.L: Quote, Profile, Research), a British company specialising in renewable energy projects and emissions instruments, said its risk-adjusted carbon credit portfolio had dropped due to project delays and revaluations. In a trading update on Tuesday the company said its risk-adjusted carbon credits — a key measure which represents how many carbon dioxide reductions the company plans to make — fell by 3.682 million tonnes between March 27 and Aug. …