We conducted our assurance engagement in accordance with the International Standard on Assurance Engagements Engagements other than Audits or Reviews of Historical Financial Information (ISAE 3000(Revised)), and, in respect of greenhouse gas emissions, International Standard on Assurance Engagements 3410, Assurance Engagements on Greenhouse Gas Statements (ISAE 3410) issued by the International Auditing and Assurance Standards Board.