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

While natural gas is primarily composed of methane (CH4), which contains hydrogen, burning natural gas does not produce hydrogen as a direct byproduct. Instead, the hydrogen is part of the methane molecule, and upon combustion, it combines with oxygen to produce water (H2O) and carbon dioxide, rather than being emitted in its elemental form.

Radon is a radioactive noble 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 while it can be a concern in certain environmental contexts, it has no direct link to the burning of natural gas in power plants.

Helium is an inert gas that is not produced during the combustion of natural gas. It is found in small quantities in natural gas deposits but does not form as a combustion product. The combustion process does not generate any helium, making it unrelated to the emissions from natural gas power plants.