One woman, one daughter

http://www.salon.com/tech/htww/2007/11/21/population_growth/index.html
How's this for a headline that simply reeks of Malthusian-inspired calls for totalitarian population control:
"Top ex-pat scientist urges population curbs"?

But it's a sensationalist bait-and-switch. The text of the article, from an Australian News Corp. affiliate, is
rather unprovocative.


Immediate past president of the Royal Society, Professor Lord Robert May said that, given the threat of
climate change, a declining global population was "a prerequisite" if humanity was to achieve a
sustainable ecological footprint in the future.

Addressing the Lowy Institute in Sydney last night, Lord May said a priority was educating and
empowering women, "particularly in those cultures where this is not currently the case."


There's a big difference between urging "population curbs" and advocating the empowerment and
education of women. The first conjures up visions of a One-Child-Per-Family policy imposed on the
developing world by the already-shrinking-population-West, which is ethically and morally repugnant.
The second option happens to be sane and already working, despite the best efforts of religious groups
and other ideological bozos who are doing their best to sabotage funding for family planning programs
or prevent women from equitably participating in society.

According to News Corp., Lord Professor Robert May made one very interesting comment in passing;
"He said it was encouraging that in the past year global fertility rates fell below replacement levels for
the first time in recorded history, with the average female now having slightly less than one female child."

The female child replacement rate is technically referred to as the "net reproduction rate." I was unable
to find confirmation of the assertion that in 2006, the net reproduction rate dropped below 1.0, but I did
discover a very interesting database interface provided by the United Nations Population Division that
allowed me to generate all kinds of interesting tables regarding historical and predicted population
growth.

When I set the parameters for net reproduction rate, globally, over the last fifty and next fifty years, I
generated the following numbers:


1950-1955 1.65
1955-1960 1.71
1960-1965 1.82
1965-1970 1.87
1970-1975 1.75
1975-1980 1.58
1980-1985 1.47
1985-1990 1.41
1990-1995 1.28
1995-2000 1.18
2000-2005 1.13
2005-2010 1.10
2010-2015 1.07
2015-2020 1.05
2020-2025 1.02
2025-2030 0.99
2030-2035 0.97
2035-2040 0.96
2040-2045 0.95
2045-2050 0.94



The message of those figures is that, in the foreseeable future, global population totals will begin to
decline.

These numbers shouldn't be taken to mean that I think the world can sustainability support nine billion
people, which is the best guess on where the global population totals will peak, particularly if everyone
is living the kind of life I personally have become accustomed to in Berkeley, California. I don't know if
we can or not. But my children will likely get a chance to figure it out. The challenges we face going
forward are undoubtedly immense, but a critical first step is stabilizing population growth and we are
already headed in that direction. And we'll get there, provided the world beefs up its focus on providing
education, health care, and pathways to economic opportunity for the world's women.

And lots of free condoms for the men.

-- Andrew Leonard


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