The human population on earth has grown more in the last 50 years than it did in the previous 4 million years. It took almost all of human history – until the early 1800s - to reach a global population of 1 billion. Today, we’re at over 6.7 billion and adding an estimated 74 million people to the planet every year. In fact, the United Nations believes that we’ll reach 9 billion by 2050. Such a large population will put a huge strain on already stretched resources, making severe food and water shortages far more likely.
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