i.e. products / regular waste collection services / prime products / street cleaning services / food / municipal sewage network / i . e .ii . e ..i . e .ei . e ..i . e . i . e .pi . e .ri . e .oi . e .di . e .ui . e .ci . e .ti . e .si . e . / /
Person
Population / Ulrich Wieland / /
Product
materials Evolution / materials Increasing production / use / /