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Which gas is primarily responsible for the greenhouse effect in the Earth's atmosphere?
Nitrogen
Oxygen
Carbon dioxide
Argon
Carbon dioxide
Carbon dioxide (CO2тАЛ) is primarily responsible for the greenhouse effect in the Earth's atmosphere alongside water vapor. It absorbs and emits thermal infrared radiation, trapping heat within the atmosphere and keeping the Earth's surface warm enough to sustain life.
Carbon dioxide (CO2тАЛ) is primarily responsible for the greenhouse effect in the Earth's atmosphere alongside water vapor. It absorbs and emits thermal infrared radiation, trapping heat within the atmosphere and keeping the Earth's surface warm enough to sustain life.
This is similar to how a glass greenhouse traps heat inside: sunlight passes easily through the glass and warms the interior, but the heat radiated from inside cannot escape easily through the glass.
CO2 = Carbon Traps Outgoing heat (C-T-O)
CO2тАЛ тАФ Carbon dioxide molecule
H2тАЛO тАФ Water vapor
Shortwave solar radiation passes through the atmosphere and warms the Earth's surface. The surface radiates this energy back as longwave infrared radiation, which is absorbed by greenhouse gas molecules like CO2тАЛ due to their vibrational modes and dipole moment changes, re-emitting heat in all directions.
Nitrogen and Oxygen constitute over 99% of the dry atmosphere but do not absorb thermal infrared radiation because they are homonuclear diatomic molecules.
Greenhouse gases absorb longwave terrestrial radiation and re-emit it toward the surface, causing the greenhouse effect.
Anthropogenic emissions have significantly increased atmospheric CO2тАЛ concentrations, enhancing global warming.
Natural greenhouse effect maintains Earth's average temperature at a habitable ~15┬░C.
Excessive greenhouse gases lead to global climate change, melting ice caps, and sea-level rise.
Climate modeling
Atmospheric science
Environmental monitoring
Normal atmospheric concentration of CO2тАЛ is currently over 420 ppm.
Option A (Nitrogen) and Option B (Oxygen) make up ~78% and ~21% of the atmosphere respectively but are transparent to infrared radiation.
C is correct тАФ Carbon dioxide is the primary greenhouse gas responsible for trapping thermal infrared radiation in the Earth's atmosphere.
Always remember that abundance in the atmosphere does not equate to greenhouse potency; homonuclear molecules like N2тАЛ and O2тАЛ do not contribute to the greenhouse effect.