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Which gas is primarily responsible for the greenhouse effect on Earth?
Nitrogen
Oxygen
Carbon Dioxide
Argon
Carbon Dioxide
Carbon dioxide (CO2тАЛ) is the primary greenhouse gas responsible for trapping heat in Earth's atmosphere, leading to the greenhouse effect. Although water vapor is more abundant, carbon dioxide is the primary driver of long-term climate changes and atmospheric warming due to its persistence and absorption properties.
Carbon dioxide (CO2тАЛ) is the primary greenhouse gas responsible for trapping heat in Earth's atmosphere, leading to the greenhouse effect. Although water vapor is more abundant, carbon dioxide is the primary driver of long-term climate changes and atmospheric warming due to its persistence and absorption properties.
It acts just like a glass greenhouse or a car parked in the sun with rolled-up windows: sunlight enters easily, but the heat gets trapped inside.
CARB: Carbon Absorbs Radiation Beneficially (though too much heats us up!)
CO2тАЛ тАФ Carbon Dioxide Molecule
H2тАЛO тАФ Water Vapor (Secondary major greenhouse gas)
Incoming shortwave solar radiation passes through the atmosphere and warms Earth's surface. The surface radiates this energy back as longwave infrared radiation, which is absorbed and re-emitted in all directions by greenhouse gas molecules like CO2тАЛ, trapping heat close to the surface.
Carbon dioxide absorbs and emits infrared radiation.
Nitrogen (N2тАЛ) and Oxygen (O2тАЛ) make up ~99% of the atmosphere but do not absorb infrared radiation because they are homonuclear diatomic molecules.
Enhancement of the greenhouse effect leads to global warming.
Maintains Earth's average temperature at a habitable ~15┬░C instead of a freezing -18┬░C.
Excess accumulation due to anthropogenic activities causes global warming, climate change, and sea-level rise.
Climate modeling and environmental monitoring
Understanding planetary atmospheres (e.g., Venus's runaway greenhouse effect)
Normal atmospheric concentration of CO2тАЛ is currently above 420 ppm.
Option A (Nitrogen) and Option B (Oxygen) are transparent to infrared radiation. Option D (Argon) is an inert noble gas.
C is correct тАФ Carbon Dioxide is the primary greenhouse gas responsible for trapping outgoing terrestrial radiation and regulating Earth's temperature.
Remember that homonuclear diatomic gases like N2тАЛ and O2тАЛ do not contribute to the greenhouse effect because they lack a permanent dipole moment during vibration.
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