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4. An alternative to standard aviation fuel is hydrogen (H₂). When hydrogen is combusted the product is water vapor; there are no direct CO₂ emissions. However, the standard way to produce

hydrogen today is by steam reforming of methane (CH₂); that process results in emissions of 0.07 kg CO₂e/MJ. Is hydrogen from this process of steam methane reforming a viable approach to reducing CO₂ emissions from aviation? Explain.

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