http://en.wikipedia.org/wiki/Image:LA2-Blitz-0263.jpg
In the above picture, wikipedia lists the top 8 boxes as belonging to the caucasian race.
http://en.wikipedia.org/wiki/Caucasian_race
http://en.wikipedia.org/wiki/Image:LA2-Blitz-0264.jpg
Using atlases, census records, etc.. It appears that the world population is roughly:
Caucasian 20%
Negroid 20%
Asian 45%
mixed 15%
Feel free to state your opinions.