The Pope has just released a papal encyclical warning ’The Earth, our home, is beginning to look more and more like an immense pile of filth. Doomsday predictions can no longer be met with irony or disdain. We may well be leaving to coming generations debris, desolation and filth’. This is marvellous of course, but wouldn’t it be fantastic if the Pope told his followers that they have done more than enough of ‘going forth and multiplying their seed’, and it is now time for ‘enough already’.