Hydrogen economy

The hydrogen economy is the idea of using hydrogen as an energy carrier alongside electricity, as a long term option for cutting greenhouse gas emissions where cleaner alternatives are not yet available. As of 2021 most hydrogen produced is grey hydrogen made from natural gas, which itself accounted for about 1.8 percent of global greenhouse gas emissions that year, while lower carbon blue and green hydrogen together made up less than 1 percent of production. Of the roughly 100 million tonnes of hydrogen produced worldwide in 2021, 43 percent went to oil refining and 57 percent to industrial uses such as ammonia fertilizer and methanol. Future use is expected to concentrate on heavy industry, long haul transport and energy storage, since hydrogen is harder to store and move than electricity and carries a higher explosion risk, while uses such as light vehicles and building heating are increasingly seen as better served by direct electrification. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/