If we can't trade aviation emissions away, and there's no technology fix, will domestic flights have to face the chop?
Big news on aviation emissions, as the Committee on Climate Change - the government's own independent scientific emissions watchdog - have said that the UK's aviation emissions should be 'capped'.
This would mean that they must remain at or below 2005 levels. When the government announced the third runway at Heathrow, they did say that they would do something similar, but the big caveat was that this cap would be flexible, in that it would be possible for the aviation industry to buy carbon credits through the European emissions trading scheme, to balance growing emissions.