In 2018, the UN panel on climate change updated its estimate for how quickly the world needs to move to reduce the increase of CO2 in the atmosphere, from the 80 percent reduction by 2050 pledged in the Paris Accord to a net-zero increase by that year. By that time, however, worldwide energy needs are projected to essentially double, to 28–30 trillion watts; currently, 85 percent of that energy comes from burning fossil fuels. Clearly, the world will have to find another source of energy; hydrogen is a prime candidate.
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Volume 62, Issue 4, July-August, 2019