Stop having children to combat climate change??

The simplest truths are sometimes the hardest to recognise. This month, according to the UN, world population will reach 6.7 billion, en route to a newly revised global total of 9.2 billion by 2050. The latest housing forecasts for England predict that we will need about 5m more homes in the next two decades.

The economist Jeffrey Sachs devoted this spring's Reith lectures to a planet "bursting at the seams". And the most recent Social Trends analysis from the Office for National Statistics painted a picture of a Britain driven mad by overcrowding. Meanwhile, Gaia scientist James Lovelock has been warning about ecological collapse and world resources able to support only 500 million people, with many extra millions driven to take refuge in the UK.

In the midst of all these alarms is a very quiet place where the green lobby should be talking about human population growth. Today has been designated World Population Day by the UN, but you will not see any of the big environment and development groups mounting a campaign on population. Indeed, you will be lucky if they even mention the P-word. Earlier this year, Nafis Sadik, former director of the UN's population fund, berated such non-governmental organisations for being more concerned with fundraising than advocacy. Their silence on population, she observed, was "deafening".

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