Question

Which is classified as a "greenhouse gas"?

1) carbon dioxide
2) chlorofluorocarbons
3) methane
4) All of these are "greenhouse gases".

Answer 1

All the listed gases, carbon dioxide, chlorofluorocarbons, and methane, are greenhouse gases that contribute to the greenhouse effect and global warming by trapping heat in Earth's atmosphere.

Step-by-step explanation:

All of the options listed, carbon dioxide (CO₂), chlorofluorocarbons (CFCs), and methane (CH₄), are classified as greenhouse gases. These gases have the ability to absorb and re-radiate infrared energy, contributing to the greenhouse effect.

Greenhouse gases like CO₂, CH₄, and CFCs, along with others such as nitrous oxide and water vapor, act like the glass of a greenhouse, allowing sunlight to enter the Earth's atmosphere and preventing heat from escaping. The major greenhouse gas in terms of its effect on climate is carbon dioxide.