CIESIN
The Center for International Earth Science Information Network (CIESIN) was founded in 1989 as an independent NGO in the federal state of New York. The institute focuses on research about correlation and interaction between human and environment. For this they publish a huge number of global data sets. Beside information about climate, agriculture or infrastructure CIESIN administrates a data base about the global population, which is based on national and UN-statistics. This allows a temporal and spatial differentiated comparison.