Interesting.  Note how many of the above top ten pollution problems globally are either a) the result of poverty or b) poor governance.  Indoor air pollution? A problem in homes where most cooking is done over open fires day in and day out.  Low-tech lead battery recycling? Done by children eking out some sort of existence with their families on the very fringes of modern society.  Untreated sewage? The result of communities sprawling beyond capacity and who are either too poor or too poorly managed to take care of the problem.  The correlations continue, but time does not allow me to continue.  I will point out, too, that almost all of the top ten pose also serious human health hazards, especially difficult to deal with in an environment of urban and rural poverty and eroded confidence in the state.