It seems that I discovered Swedish born statistician Hans Rosling a little too late. He died February 7th, 2017 of cancer, just before I stumbled upon his many inspiring talks on the changing facts of world data.
A point Rosling made over and over again is that many of us are operating with 20 or 30 year old statistics in our heads in terms of how we think the world is. We tend to think, for example, that many third world countries today are statistically where they were in the 1980s and 90s in terms of birth rates and poverty rates. This makes us mistakenly think that in countries like India and Bangladesh, women are still on average having 6 or 7 kids. In the last 30 years, birth rates have dropped in almost the entire world, and it is always directly correlated with reductions of poverty and rising standards of living.
This brings me to the topic of religion and birth rates. It is commonly believed that religions like Islam encourage high birth rates and that this will ensure that the population of Muslims around the world will outpace and outnumber all other religions and those without religion. While it is true that Muslim majority countries have on average more children per woman than non-Muslim countries, when the standard of living is raised, the birth rate drops, just as it does in the rest of the Western world.
In India in 2018 the birth rate is 2.2 per woman, in Bangladesh it is 2.0, Indonesia, 2.3, Iran, 1.6, Bahrain, 1.9, Qatar, 1.8, Turkey, 2.0, and Saudi Arabia, 2.4. These countries have dramatically increased their standard of living since the 1980s, when they had birth rates 2 or 3 times higher. To put this in perspective, the US birth rate in 2018 was 1.9, roughly on par with many of these countries.
Muslim majority countries that haven't increased their standard of living, like Afghanistan, Iraq, Somalia, and Mauritania, still have high birth rates of 4.3, 4.2, 6.0, and 4.5 respectively.
What this all means is 2 things: (1) the Islamic world is not immune to lower, Western-level birth rates. That is to say, there is nothing necessarily intrinsic about Islam that prevents countries from lowering their birth rate as they economically advance, and (2) to lower birth rates one must tackle poverty. This means it is not necessarily the case that Islam will come to dominate the future population with its higher birth rates as organizations like PEW have predicted (to which I think they made several mistakes).
Watch Rosling explain in his eccentric way in more detail in his 2012 Ted talk. (Also check out his site gapminder.org to see the data for yourself).
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