Natural gas-fired power plants are considered greenhouse gas emitters because the burning of natural gas produces which of the following?

While hydrogen can be produced from natural gas through processes like steam reforming, it is not a direct byproduct of combustion. The burning of natural gas primarily results in carbon dioxide and water vapor, not hydrogen. Thus, hydrogen does not contribute to the greenhouse gas emissions from natural gas combustion.

Radon is a naturally occurring radioactive gas that is not produced during the combustion of natural gas. It is typically associated with the decay of uranium in soil and rock, and although natural gas extraction can occasionally release radon, it is not a product of burning natural gas. Therefore, it does not relate to greenhouse gas emissions from power plants.

Helium is an inert gas that does not participate in combustion reactions. It is not a byproduct of burning natural gas and, therefore, does not contribute to greenhouse gas emissions. Helium is typically found in natural gas deposits but is not produced through the combustion process.