[mhartl]

It's only alarming if you believe that the human population is close to the carrying capacity of the Earth. Given that the densest population centers are also the richest, this seems unlikely. Environmental and associated problems are not the result of brute numbers.

All of these population graphs play the same trick on your eye by using a vertical scale set by the current population. This is an understandable choice, but as a side-effect it makes the current growth look "vertical", when in fact for an exponential the location of the "knee" in the curve is purely an artifact of the vertical scale. If you graph the world population in millions, the current situation looks terrifying; if you graph it in billions, it looks alarming; if you graph it in trillions, it looks like we've got nothing to worry about.

[suivix]

Not to mention that the richest places are actually having less than two children per woman.

[mhartl]

Indeed. Due in part to lower birthrates in rich countries and increasing wealth across the board, demographers predict that the current population growth will flatten out around 2050, at an estimated 8-10 billion people. Humanity faces many problems, but "overpopulation" isn't one of them.