Clean transportation is a political and economic imperative. Driven by new efforts to reduce greenhouse gas (emissions and air pollution), the development of emerging technologies will play an increasing role in the future of transportation and possibly other sectors of the economy. Some of these technologies may replace internal combustion engines in some applications, but the availability and cost framework has not been adequately clarified. As we wait for sustainable, energy-saving alternatives to mature and adequately scale, immediate action can be taken to reduce emissions by retrofitting existing diesel-powered engines and other equipment to protect human health and the environment today

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