Reuters: Canadian environmental groups asked regulators on Wednesday to rescind approvals for part of a $13.7 billion expansion of Royal Dutch Shell Plc’s oil sands project, alleging the company backed off promises to cut greenhouse gas emissions. The Oil Sands Environmental Coalition — which includes the Pembina Institute, the Toxics Watch Society of Alberta and the Fort McMurray Environmental Association — say Shell has broken a negotiated agreement to significantly cut the output of …