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Given that we have 7 billion people on the planet and climbing, we definitely do need to figure out what's causing the infertility so we can promote it throughout the world.

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Given the distribution, western societies already know how to not reproduce. Now we need the opposite.

it's pretty simple: quit educating the females.

Think I'm joking? There are studies proving an inverse correlation between education and number of progeny.

Actually when you apply the correlation between rising income levels and lowering reproduction rates to the projections of rising incomes of those who are now poor and reproducing at (relatively) high rates, global population is expected to start falling in as little as 20 years (admittedly this is a political topic and these is a wide range of projections available, including many who foresee an increase to 15 or 20 billion in 100 years).

Either way, what's causing infertility is quite obvious - economic prosperity does.

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