About 1000 years ago, it got up to 1 billion.
About 100 years ago it reached 2 billion.
By 50 years ago - almost 4 billion.
Now we're fast approaching 7 billion.
In 40 years, we're looking at 9-12 billion.
So, considering that for every human on the planet, we increase our impact on the environment that much more, what should our goal be for how many humans are on the planet?
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