robly18 wrote:Well, there haven't been any major wars or baby booms in the past few decades, so yes, it is a straight line.
Why'd I miss this before? Anyways, this is exactly why it should NOT be a straight line. W/o wars or anything, unrestrained population growth (which is what this is) will be exponential. Besides, that line is just too perfect. Admit it, xkcd messed up their graph!!!
Don't forget: more developed countries means less babies!
The following website, which I cite because it was the first result on google, tells us the following:http://www.infoplease.com/ipa/A0762181.html
Baby population in - Total world population
1980 - 4,453,831,714
1990 - 5,278,639,789
2000 - 6,082,966,429
Let's see if this checks out:
Population in 1980 was about 4.5 million. The graphic is around the same area. Check.
Population in 1990 was around 5.25 million. Graphic appears to check out.
Population in 2000 was just over 6 million. Graph looks about right to me.
I couldn't find any (reliable) sources giving me total world population in 2010 without being a projection, but that probably has to do with me not digging deep enough.
Nonetheless, it's pretty noticeable how the population did rise in a linear manner:
4.5 + 0.75 = 5.25
5.25 + 0.75 = 6
So the graphic does check out.
Ergo, the graphic is correct.
Convincing people that 0.9999... = 1 since 2012