Dr. James Glynn:

Looking at the list of gases, my main point around the definition of the list of gases is that it does not look complete. There is international evidence from the Intergovernmental Panel on Climate Change, IPCC, on the full list of gases from the old Kyoto Protocol and then more recent legislation around specific gases from United Nations Framework Convention on Climate Change, UNFCCC, agreements. More recently, there has been increasing debate around the suitability of carbon budgets and the role of short-term versus long-term or long-lived gases and their use in carbon budgets. As such, the suitability of some gases to be used in long-term carbon budgets is questionable. There should be a list of short-term gases that are appropriate for a five-year carbon budget and then maybe a different list of gases appropriate for longer-term carbon budgets.