There's a new campaign in Britain to encourage couples to limit their family size to two children. See BBC News. The Optimum Population Trust (OPT) is launching the online pledge campaign, called "Stop at Two" this week.
Jonathon Porritt is a patron of OPT and says that parents who have more than two children are "irresponsible" for putting a burden on resources and damaging eco-systems. The OPT believes that the future of the planet should play a large part in planning a family, and Porritt says "I think we will work our way towards a position that says having more than two children is irresponsible."