World's Most Important Graph. . 4, 000, 000, 000 U. World Population Prospects: 201 7 Revision 3, 500, 000, 000 Graph by Steve Sailer from UN. data 3, 000, 000, World's Most Important Graph 4 000 U World Population Prospects: 201 7 Revision 3 500 by Steve Sailer from UN data