if you do the math...

Finally, a logical argument for having children, courtesy of The New Criterion:

“Replacement” fertility rate—i.e., the number you need for merely a stable population, not getting any bigger, not getting any smaller—is 2.1 babies per woman. Some countries are well above that: the global fertility leader, Somalia, is 6.91, Niger 6.83, Afghanistan 6.78, Yemen 6.75. Notice what those nations have in common?

Scroll way down to the bottom of the Hot One Hundred top breeders and you’ll eventually find the United States, hovering just at replacement rate with 2.07 births per woman. Ireland is 1.87, New Zealand 1.79, Australia 1.76. But Canada’s fertility rate is down to 1.5, well below replacement rate; Germany and Austria are at 1.3, the brink of the death spiral; Russia and Italy are at 1.2; Spain 1.1, about half replacement rate. That’s to say, Spain’s population is halving every generation. By 2050, Italy’s population will have fallen by 22 percent, Bulgaria’s by 36 percent, Estonia’s by 52 percent. In America, demographic trends suggest that the blue states ought to apply for honorary membership of the EU: in the 2004 election, John Kerry won the sixteen with the lowest birth rates; George W. Bush took twenty-five of the twenty-six states with the highest. By 2050, there will be 100 million fewer Europeans, 100 million more Americans—and mostly red-state Americans.

That's a scary thought. I wonder what the numbers for China and Japan look like?