What would be ideal global human population total? Now it%26#039;s a little more than 6 billion.
Is bigger or smaller better?

Definitely fewer, we use resources faster than we can naturally replace them. I%26#039;m of the opinion it should be 1 billion.

I once heard a claim that the planet is only designed to handle 1/10 of that many people.

3 to 3.5 billion tops

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it%26#039;s like 6.5 billion I think.