12 thousand years ago, there were 4 million people on the planet  – that’s just half of London today . Since then, the population has grown a lot, at first slowly, and now very quickly ! Now there are 7.7 billion of us, and it’s expected that there will be 9.7 billion by 2050, and nearly 11 billion around 2100 . What effect does this have on climate change?
The problem is that more people means more food , more electricity, more flying etc., which in turn causes more global warming . Worse, as people get richer, they tend to lead lives that cause release of more CO2 . Getting everyone on the planet to live in an Earth-friendly way is, historically, incredibly difficult ; slowing population growth would help a lot though .
But can we slow population growth while being fair to everyone? Yes! In fact, increasing equality helps slow population growth ! The best methods are improving healthcare, giving education to everyone, and family planning; especially in countries where people often die very young . If people expect their children to live longer, they tend to have fewer children .
Although the population is still growing, it is now growing slower than in the past . This means that over time there will proportionally be more older people than there are now – we have an “ageing population” . Currently only 1 in 11 people are over 65, but this will increase to 1 in 6 by 2050 ! This presents different challenges to those of over population, such as providing enough quality care for older people .
Graph from the United Nations, 2019 . Pink lines are 95% predication intervals – there’s a 95% chance that the population will fall somewhere between these lines.
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