First step is to determine how many world births are currently unwelcome. Do we know this? If the number is small then coercion to achieve this aim is unavoidab

First step is to determine how many world births are currently unwelcome. Do we know this? If the number is small then coercion to achieve this aim is unavoidable. That's a bit euphemistic. Better say, explicit or implicit (chemical treatment of the water?) implementation by force. Serious proposals to say the least. Shouldn't Attenborough tell us what he has in mind before throwing out such a suggestion?