Yeah, I'm familiar with Malthus. I also recognize that we may be approaching a technological singularity. And that the slope of the population curve is going logarithmic.
That's the problem when attempting to interpolate the future based on the past. I've also seen the "cone of humanity" foto where all the people in the world don't make a very big dent in the Grand Canyon when stacked on top of each other. Unfortunately, the infrastructural imperative doesn't have quite the same effect.
And every time someone says "it'll be different this time. I promise." It will fail this time too. Probably somewhere around the Tricentennial.