Greater London Authority Bill

My Lords, I have a question about the term ““significant””, which the Government have chosen. I wondered whether it was chosen to allow for developing scientific knowledge about which greenhouse gases, or substances, will have a ““significant”” effect, although the amendment does not appear to deal with that. The Minister introduced the amendment by saying that this was one of the Mayor’s priorities, but I was not clear whether that went to the term ““significant”” or just to proposed new subsection (3)(b), which cites, "““substances … which the Mayor considers it appropriate to deal with in the strategy””." As for the Mayor’s approach to priorities in these matters, does that refer to prioritising the list of substances or to priority in dealing with the substance as opposed to a completely different strategy? I am not sure what priorities we are comparing here. My original note just asks for the Government’s confirmation that the Mayor must act reasonably. I realise that the question I have just asked goes a good deal further.