1) Guardian visualizes world population growth estimates from UN. Nice comparison of similar countries, but results for Africa don’t look right 314 million people in Tanzania in 2100? 140 million people in Niger in 2100? A ten fold increase in its current population density?

2) From BBC – how much has the world population grown since your birth? Since mine, its doubled.

3) National Geographic on 7 Billion

4) and from Nature news

Because high fertility is linked with poverty, the big worry globally is the 3.4 billion people who survive on less than US$2 per day, says Joel Cohen, who heads the Laboratory of Populations at the Rockefeller University in New York. The average number of children per woman in the least developed countries is 4.5, compared with 1.7 for developed countries, Cohen says, and this means that most of the additions to the global count are born where there is little access to energy and education, further fuelling the population steamroller. This reality underscores the importance of international development efforts: small increases in wealth and education can lower fertility and dramatically ease the burden of population growth decades down the road.

5) And population data from the UN Population Divsion.