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That’s from the World Bank’s new “What a Waste” report, which estimates that 1 to 5 percent of the world’s urban population is employed in some form of solid-waste management — that includes everyone from workers at recycling plants to the more than 2 million informal “waste-pickers” in poorer countries.And the garbage will keep piling up. Currently, the world spends $205.4 billion to handle about 1.3 billion tons of trash each year.