Various technical fixes and changes in behavior are proposed, the former generally having price tags of order trillions of dollars. Spread over several decades, these are arguably affordable, and to be preferred to the environmental damage and economic collapse which may otherwise occur.

“But by avoiding a fraction of the projected population increase, the emissions savings could be significant and would be at a cost, based on UN experience of reproductive health programs, that would be as little as one-thousandth of the technological fixes. The reality is that while the footprint of each individual cannot be reduced to zero, the absence of an individual does do so.“Although I'm now the director of the British Antarctic Survey, I was previously executive director of the International Geosphere-Biosphere program, looking at the chemistry and biology of how Earth works as a system. About 18 months ago, I wrote an article for the BBC Green Room website in which I raised the issues:

"So if we believe that the size of the human footprint is a serious problem (and there is much evidence for this) then a rational view would be that along with a raft of measures to reduce the footprint per person, the issue of population management must be addressed."In practice, of course, it is a bombshell of a topic, with profound and emotive issues of ethics, morality, equity and practicability."

So controversial is the subject that it has become the Cinderella of the great sustainability debate - rarely visible in public, or even in private. In interdisciplinary meetings addressing how the planet functions as an integrated whole, demographers and population specialists are usually notable by their absence. Rare, indeed, are the opportunities for religious leaders, philosophers, moralists, policy-makers, politicians and the global public to debate the trajectory of the world's human population in the context of its stress on the Earth system, and to decide what might be done.

“The response from around the world was strong and positive - along the lines of "at last, this issue has been raised". But after that initial burst of enthusiasm, I find that little has changed. This is a pity, since as time passes, so our ability to leave the world in a better state is reduced. Today's report from the UN provides an opportunity to raise the debate once again. For the sake of future generations, I hope that others will this time take up the challenge.”

As Rapley so aptly said it, we continue to continue ignoring the obvious—at our peril. My best guess? The United States continues on the same path as China, India, Bangladesh, Mexico, Africa and the rest of them until our misery exceeds our ability to continue growing.

Unfortunately, by that time, it will not be pretty. In fact, it will be awfully ugly.

Frosty Wooldridge has bicycled across six continents – from the Arctic to the South Pole – as well as six times across the USA, coast to coast and border to border. In 2005, he bicycled from the Arctic Circle, Norway to Athens, Greece. He presents “The Coming Population Crisis in America: and what you can do about it” to civic clubs, church groups, high schools and colleges. He works to bring about sensible world population balance at his website www.frostywooldridge.com

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