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From the article:

>40 per cent of the world's 8.2 billion people live in rural areas

>the rural population is underestimated by half

Based on the first statement: 8.2*0.4=3.28 billion rural globally;

And according to the second statement, there re actually twice as many, so another 3.28 billion people, or:

8.2+3.28=over 11 billion in total on Earth.