Our population is rising while our ability to sustain life on Earth is shrinking – we must change before nature does it for us.

The 7 Billion Day is a sobering reminder of our planet's predicament. We are increasing by 10,000 an hour. The median UN forecast is 9.3 billion by 2050, but the range varies by 2.5 billion – the total world population in 1950 – depending on how we work it out.

Guardian

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