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Greenhouse gases are any gas that lets out and absorbs solar energy, heat energy, and light. Carbon dioxide (CO2) is an important gas in the earth’s atmosphere and part of the carbon cycle, which allows for plants to photosynthesize and animals to create energy. CO2 absorbs and creates infrared light radiation (which is not normally visible to the human eye) making it a greenhouse gas. 
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Carbon dioxide acts as a greenhouse gas, trapping heat in the earth's atmosphere. Plants convert carbon dioxide into oxygen during photosynthesis, the process they use to make their own food. Chemical A substance formed from two or more atoms that unite (bond) in fixed proportion and structure.
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Carbon dioxide is called a greenhouse gas because it is one of the gases in the atmosphere that warms the Earth through a phenomenon called the greenhouse effect. 

Carbon dioxide molecules in the atmosphere absorb long-wavelength infrared energy (heat) from the Earth and then re-radiate it, some of it back downward. This effectively traps heat around the Earth.

Carbon dioxide (CO₂) is one of several greenhouse gases in the atmosphere. They are referred to as greenhouse gases because, like the glass of a greenhouse, they let visible light from the Sun pass through the atmosphere but they absorb long-wavelength infrared energy from the Earth and keep the atmosphere warm. The idea of the warm interior of a greenhouse is just a useful metaphor for how gases in the atmosphere keep the surface of the Earth warm—there are no panes of glass in the atmosphere!
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Carbon dioxide (CO2) is referred to as a "greenhouse gas" because it traps heat in the Earth's atmosphere, much like the glass walls of a greenhouse trap heat inside. When sunlight reaches the Earth, some of it is reflected back into space and the rest is absorbed by the land and oceans. However, some of the absorbed heat is also re-emitted back into the atmosphere as longwave infrared radiation. Greenhouse gases, such as CO2, absorb this longwave radiation and trap heat in the atmosphere, causing the planet's temperature to rise. This process is known as the "greenhouse effect", and CO2 is considered a key contributor to global warming and climate change.
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Carbon dioxide is also called green house gas because it traps heat similar to the glass roof of a green house and allow sunlight enter the earth atmosphere.
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Gases in the atmosphere, such as carbon dioxide, trap heat similar to the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.
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CO2 is called a greenhouse gas because it traps heat in the Earth's atmosphere, much like the glass of a greenhouse traps heat inside. This can contribute to global warming and climate change.
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