David and Victoria Beckham may have been overjoyed to welcome their new daughter, Harper Seven, last week but, according to a growing group of campaigners, the birth of their fourth child make the couple bad role models and environmentally irresponsible.
As the world's population is due to hit seven billion at some point in the next few days, there is an increasing call for the UK to open a public debate about how many children people have.
Now the Green MP, Caroline Lucas, has joined other leading environmentalists in calling for the smashing of what TV zoologist Sir David Attenborough has called the "absurd taboo" in discussing family size in the UK.
Do you believe in population control? Should we all stop at two kids? Have your say on the discussion of the day...
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