Population
Population growth drives or multiplies many of the critical problems we face today.
In fact, without the multiplier of population, it could be argued that many of the problems we face would not qualify as "global."
Between 1900 and 1999, world population quadrupled. Just between 1960 and 1999 it more than doubled, from three billion to over six billion.
We are currently
growing by more than 80 million people every year.
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