Green hydrogen has the potential to lower emissions across various sectors, including ammonia and methanol production, oil refining, transportation, and power generation. To be considered ‘green’, hydrogen must be produced using an electrolyzer that is powered by renewable energy. Electrolyzers take water as an input and use electricity to split the water into oxygen and hydrogen. Therefore, green hydrogen production requires access to renewable energy and water. However, water may prove to be a scarce resource for green hydrogen production in certain regions due to large swaths of the country experiencing some level of prolonged drought, some even since 2000.
Calculations are based on drought severity, the percentage area in drought, and the population density of each county. As expected, much of the western US is facing intense and pervasive drought conditions, which happens to also be the location of a small number of proposed green hydrogen projects. the same applies to Europe and the rest of the world, one links with the other. If they are placed by the sea then desalination needs to be considered with the waste there also a problem.

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