At the beginning of the 21st century, the world's population already reached the size of:

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GPT explains (level =C2; CEFR aligned): Seven billion humans by the dawn of the 21st century At the stroke of Y2K we commemorated the planet’s most ambitious crowd-sourcing project: quadrupling our numbers in a single century and still asking where the traffic came from. Seven billion is less a statistic than a collective homework problem we filed under “deal with later”—preferably by 2070 when the sequel is projected at ten billion plus. 🫩