I don't think it should be compulsory but then I am pretty sure he didn't say it should.
We do need to be having less children. I think 1 or 2 is enough surely for anyone?
Me and DH chose to be child free partly because of overpopulation and we made that decision nearly 40 years ago!
I just don't get how people go on about not flying, recycling, not using plastic etc and don't mention overpopulation. It is one of the main, if not THE main, causes of climate change.
I know we have an ageing population but keep having more children cannot possibly be the answer although I don't know what the answer is.
Even if the planet was not overpopulated and there was no threat of climate change the UK is overcrowded as it is. Hospitals and GP surgeries can't cope, schools can't cope, there is not enough housing, not enough work, the transport can't cope and let's not even start about the traffic on our roads.