Bloomberg: Royal Dutch Shell Plc, Exxon Mobil Corp. and the rest of the oil industry may face higher costs to exploit Canada’s tar sands, the biggest deposit outside of Saudi Arabia, because of efforts to rein in climate change. A Canadian mandate to bury carbon dioxide emitted during the process of extracting the oil may add between $2 and $13 a barrel to production costs, according to Pembina, an Alberta-based environmental group. Mining crude from the area now costs around $60 a barrel. …