To ask the Secretary of State for Transport what his most recent estimate is of the percentage of total climate change impact from UK sources contributed by the UK aviation sector, as defined by the Transport White Paper 2004, as a result of radiative forcing; and how that estimate was derived. (133982)

I refer the hon. and learned Gentleman to the response I have given to the hon. Member for East Surrey (Mr. Ainsworth) today (UIN 134036).

To ask the Secretary of State for Transport what the percentage contribution of aviation to the overall UK climate change impact is, calculated on the basis of emissions attributable to UK citizens on outward and return flights from UK airports, including the radiative forcing effect. (134097)

[holding answer 1 May 2007]: I refer the hon. Member to my answer given today to his related question (UIN 134036).

There are no equivalent data which relate emissions attributable to UK citizens’ travel. The Office for National Statistics International Passenger Survey provides information from surveys of overseas visits by UK residents but this information is not directly related to emissions.