The United Nations recently announced that, according to their best estimates, the seven billionth human will be born today. The milestone has people talking: the World Food Programme points out in this video that as of now, one in seven people worldwide suffers from hunger - a billion people in all - and that the two billion people with Internet access can help.
The BBC's website includes a feature that assigns you a number based on when you were born, and places your existence in the context of history. The UN Dispatch has an eye-opening interview with the founder and president of the Population Media Center. And National Geographic offers up this video comparing our population to some other species: