'Researchers found that every $7 we spend on family planning over the next 40 years will reduce carbon dioxide emissions by over a tonne.
There is no denying the fact that human population growth has soared; at the start of the 20th century it was 1.5 billion. Thanks to advances in medicine, hygiene and technology, the population is well on its way to seven billion – and is set to reach 9.1 billion by 2050.'
Wilson da Silva, Cosmos Editor-in-Chief
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