| http://www.w3.org/ns/prov#value | - ???Power plants, factories and vehicles have all increased sulfur dioxide (SO2) and nitrogen oxide (NOx) pollution, which cause smog and acid rain and lead to health effects such as heart disease, asthma and shortened lifespans,??? says Kyung-Min Nam, a researcher in MIT???s Joint Program on the Science and Policy of Global Change. ???The increased stringency of new pollution controls reflects a g
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