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Also refer to Architecture of the Abu Dhabi BAPS temple.

Source: Volcano

Source: Wikimedia Commons
| Type | Source | Carbon Emissions | Production |
| White Hydrogen | Naturally occurring underground | None | Direct extraction |
| Green Hydrogen | Electrolysis using renewable energy | None | Water electrolysis |
| Blue Hydrogen | Natural gas with Carbon Capture Storage (CCS) | Low | SMR + CCS technology |
| Gray Hydrogen | Natural gas (Steam Methane Reforming – SMR) | High | Industrial production |
| Brown/Black Hydrogen | Coal gasification | Very High | Coal-based extraction |

Source: IE, Atlantic Council
China-Pakistan Economic Corridor (CPEC)
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Also refer to Pakistan’s Attack on Iran.

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