‘I think we will work our way towards a position that says having more than two children is irresponsible. It is the ghost at the table. We have all these big issues that everybody is looking at and then you don’t really hear anyone say the P-word.

‘Many organisations think it is not part of their business. My mission with the Friends of the Earths and the Greenpeaces of this world is to say: “You are betraying the interests of your members by refusing to address population issues and you are doing it for the wrong reasons because you think it is too controversial”.’