How many of the given statements regarding green hydrogen is/are …

Correct Answer: All three

Explanation:

1. It can be used directly as a fuel for internal combustion:
   Correct. Green hydrogen can be used as a fuel in internal combustion engines (ICEs) with modifications. Hydrogen combusts cleanly, emitting only water vapor as a byproduct, making it a potential alternative to traditional fuels.
2. It can be blended with natural gas and used as fuel for heat or power generation:
   Correct. Green hydrogen can be blended with natural gas and used in existing gas pipelines to generate heat or power. This helps reduce carbon emissions and makes use of existing infrastructure.
3. It can be used in the hydrogen fuel cell to run vehicles:
   Correct. Hydrogen fuel cells convert green hydrogen into electricity, which can power vehicles. This is already being implemented in hydrogen-powered vehicles, which emit only water vapor.

Thus, all three statements are correct.