Global demand for passenger and freight transportation continues to rise, driven by population and economic growth. As transportation demand has grown so too, inexorably, have carbon emissions from the global transportation sector. That is a trend that know cannot be permitted to continue. The destructive effects of the warming that has already occurred as a consequence of anthropogenic emissions of carbon dioxide and other greenhouse gases are dire enough. Scientists warn that we must steeply reduce greenhouse gas emissions by mid-century to avoid additional warming that will have genuinely catastrophic effects. In that light, transforming the technologies and systems that move people and goods around the world appears imperative.
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