Hisresponse is as follows:It is proposed that the principalindicator of energy performance of buildings will be expressed in terms of CO2in order to promote the influence that this gas has with regard to climate changeand global warming.Options for other indicatorswill appear in the forthcoming public consultation on Articles 7, 8 and 9. Thisconsultation is proposed for May 2006, will have a duration of 12 weeks and willbe accessible from the SBSA website www.sbsa.gov.uk.