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It is also a greenhouse gas http://agage.mit.edu/publications/global-environmental-impacts-hydrogen-economy http://agage.mit.edu/publications/global-environment

• cmrdporcupine 5y ago
  "If a global hydrogen economy replaced the current fossil fuel-based energy system and exhibited a leakage rate of 1%, then it would produce a climate impact of 0.6% of the current fossil fuel based system. " That doesn't sound so ... bad?