Which of the following contributes to global warming?

A) acid rain

B) greenhouse gases

C) tropospheric ozone

D) ozone hole

Answer: B) greenhouse gases

Greenhouse gases form a wrap around the Earth that passes heat to penetrate to the surface but not to return to the universe. Greenhouse gases are water vapor (H2O), carbon dioxide (CO2), methane (CH4), CFC · HCF · PHC (also F gases, fluorinated hydrocarbons), nitrous oxide (N2O) and sulfur hexafluoride (SF6).

The greenhouse effect is the term for heating the planet Earth caused by a disturbance of the energy balance between the amount of radiation that receives from the Sun and radiates the Earth's surface into space. This effect is the result of an increase in the amount of radiation that cannot be emitted into the universe from the surface of the Earth, but it absorbs the atmosphere and becomes warmer.