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Which gas is mainly responsible for global warming?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Helium
Correct Answer Is Option = Carbon dioxide
Notes / Explanation
The gas that is mainly responsible for global warming is carbon dioxide, which is one of the most important of the group of gases known as greenhouse gases. Global warming refers to the gradual rise in the average temperature of the Earth that has been observed, particularly in recent times, and which is a matter of serious concern because of its effects on the climate and the environment. The process behind global warming is connected to the way certain gases in the atmosphere behave. The Earth receives heat and light from the Sun, and while some of this heat is reflected back into space, a portion is trapped near the surface of the Earth by certain gases in the atmosphere, which act rather like the glass of a greenhouse by allowing the Sun's energy to enter but preventing some of the heat from escaping. This natural greenhouse effect is in fact essential for life, because without it the Earth would be far too cold to support living things. The problem arises when the amount of these greenhouse gases in the atmosphere increases beyond the natural level, because this causes more heat to be trapped and the temperature of the Earth to rise. Among the greenhouse gases, carbon dioxide is regarded as the main contributor to the warming caused by human activity, because very large quantities of it are released into the atmosphere through the burning of fuels such as coal, oil and gas, which are used to produce energy for industry, transport, electricity and many other purposes, as well as through the cutting down of forests, which would otherwise absorb carbon dioxide. As the level of carbon dioxide in the atmosphere has risen, so the warming effect has increased. The consequences of global warming include the melting of ice, rising sea levels, changes in weather patterns, and effects on agriculture, wildlife and human life, which is why reducing the release of carbon dioxide and other greenhouse gases has become an important goal. For PPSC and other competitive examinations, the key points to remember are that the gas mainly responsible for global warming is carbon dioxide, that it is a greenhouse gas that traps heat in the atmosphere, that large amounts of it are released by the burning of fuels and the cutting of forests, and that global warming leads to effects such as melting ice, rising sea levels and changes in the climate.
