The greening of planes, trains, and automobiles

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As the world races to decarbonize everything from the electricity grid to industry, it faces particular problems with transportation—which alone is responsible for about a quarter of our planet’s energy-related greenhouse gas emissions. The fuels for transport need to be not just green, cheap, and powerful, but also lightweight and safe enough to be carried around.

Fossil fuels—mainly gasoline and diesel—have been extraordinarily effective at powering a diverse range of mobile machines. Since the Industrial Revolution, humanity has perfected the art of dredging these up, refining them, distributing them and combusting them in engines, creating a vast

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