| http://www.w3.org/ns/prov#value | - It is possible to prohibit specific, particularly hazardous chemicals (DDT, PCBs, CFCs, etc.), since such regulations are limited to few products and the negative economic impact is only borne by a small number of firms and industries (note: serious efforts to try to limit CO2 or other greenhouse gas emissions would affect many sectors and companies negatively and the costs are thus perceived as t
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