The pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s.
The graph and table below show the number of fishers in millions for different regions in 1980, 1990, and 2000, and the world's top exporters of fish in 2000.
The charts below show the growth in the population in some of the world’s largest cities as well as the population distribution in urban and rural areas.