Hydrogen colors

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Across
  1. 3. Hydrogen with high CO₂ emissions, from natural gas or coal.
  2. 4. Refers to naturally occurring hydrogen found in the earth, often from geological processes.
  3. 6. Produced using nuclear energy to electrolyze water, leveraging carbon-free nuclear power to create hydrogen.
Down
  1. 1. Produced from coal or lignite, resulting in high CO₂ emissions and considered the least environmentally friendly.
  2. 2. Created from methane pyrolysis
  3. 5. Created by methane pyrolysis, where methane is split into hydrogen and solid carbon. The carbon can potentially be stored or used in other applications.