The correct answer is A. Hydrogen.
Greenhouse gases are gases that trap heat in the atmosphere, causing the planet to warm. The main greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
Hydrogen is not a greenhouse gas because it is a very light gas that escapes the atmosphere easily. It also does not absorb or emit infrared radiation, which is the type of radiation that causes the greenhouse effect.
Carbon dioxide is a greenhouse gas because it absorbs infrared radiation. When sunlight hits the Earth’s surface, some of the energy is reflected back into space, but some of it is absorbed by the Earth’s surface. The Earth’s surface then re-emits this energy as infrared radiation. Carbon dioxide absorbs this infrared radiation, trapping heat in the atmosphere.
Methane is a greenhouse gas because it is also a good absorber of infrared radiation. Methane is produced by natural processes, such as decomposition of organic matter, and by human activities, such as agriculture and waste management.
Nitrous oxide is a greenhouse gas because it is also a good absorber of infrared radiation. Nitrous oxide
is produced by natural processes, such as the decomposition of nitrogenous fertilizers, and by human activities, such as agriculture and fossil fuel combustion.Ozone is a greenhouse gas because it is a good absorber of infrared radiation. Ozone is produced in the stratosphere by the action of sunlight on oxygen molecules. It is also produced in the troposphere by human activities, such as the burning of fossil fuels.
Chlorofluorocarbons (CFCs) are greenhouse gases because they are good absorbers of infrared radiation. CFCs were once widely used in refrigerants and aerosol propellants, but they have been banned since the 1980s because they damage the ozone layer.