| http://www.w3.org/ns/prov#value | - ess-as-usual output.Power companies and factories will be able to trade a gradually decreasing number of permits to emit carbon dioxide and other greenhouse gases under the so-called cap-and-trade plan, which counts on market forces leading companies to find the cheapest way to cut emissions.About 350 companies representing 600 California factories and oil refineries must begin complying with the
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