To ask the Scottish Executive what the impact on carbon dioxide emissions would be of raising the energy performance of all homes to Energy Performance Certificate rating (a) A, (b) B, (c) C, (d) D, (e) E and (f) F by (i) 2015, (ii) 2016, (iii) 2017, (iv) 2018, (v) 2019 and (vi) 2020. The information requested is not currently available.