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A team of engineers at MIT has created a concept for a hybrid-electric plane that could reduce nitrogen oxide emissions, harmful greenhouse gases that contribute to smog and acid rain, by 95 percent.Nitrogen oxides have also been shown to be associated with respiratory diseases and cardiovascular disorders, resulting in about 16,000 deaths a year, according to an MIT blurb. A 95 percent reduction in these emissions could cut those deaths by 92 percent, saving tens of thousands of lives annually.