The latest annual report on the progress of the closely-watched demonstration scheme in Alberta, trumpeted by Statoil as a model for cleaner oil sands exploitation, was dubbed “embarrassing” in a tweet by Greenpeace Norway’s leader Truls Gulowsen.

The Norwegian state-owned operator admitted the intensity of emissions had increased last year from 55.6 kilograms of CO2 per barrel of produced oil to 69.7kg