Income Inequality Seen From Space

Flying above the earth, richer areas can be distinguished from poorer ones by the amount of tree cover they have. On his One Square Mile blog, Tim De Chant looked at some research done in the US which indicates that there is a "tight relationship between per capita income and forest cover". As usual, the poor get shafted and have less trees than wealthier areas.
De Chant writes:
[T]hey found that for every one per cent ...

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