Question

What are greenhouse gasses? How does carbon dioxide enter the atmosphere? (Site 1)

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Answer 1

Greenhouse gases are atmospheric gases that absorb and re‑emit infrared radiation from Earth’s surface, trapping heat and helping to regulate the planet’s temperature; key greenhouse gases include water vapor, carbon dioxide (CO2), methane, nitrous oxide, and fluorinated gases. Carbon dioxide enters the atmosphere naturally through processes like respiration by plants and animals, decomposition of organic matter, volcanic eruptions, and release from the oceans, and it is added by human activities such as burning fossil fuels (coal, oil, and natural gas) for energy and transport, clearing or burning forests (which releases stored carbon), and certain industrial processes like cement production; when emissions exceed the ability of plants and oceans to absorb CO2, atmospheric concentrations rise and contribute to global warming.