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The greening of planes, trains, and automobiles
We need new fuels as society moves away from coal, natural gas and oil.
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. Hydrogen—the lightest element in the universe—packs a huge energy punch, but it’s expensive to make in a “green” way and, as a gas, it takes up a lot of space. Liquid fuels that carry hydrogen can be easier to transport or drop into an existing engine, but ammonia is toxic, biofuels are in short supply, and synthetic hydrocarbons are hard to produce.
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