The most recent warming trend experienced over the northern hemisphere could be the result of increasing levels of greenhouse gases
- A greenhouse gas is a gas that absorbs and emits radiant energy in the thermal infrared spectrum, resulting in the greenhouse effect. Water vapor, carbon dioxide, methane, nitrous oxide, and ozone are the primary greenhouse gases in the Earth's atmosphere.
- Carbon dioxide, methane, nitrous oxide, and water vapor (all of which occur naturally) are the main gases responsible for the greenhouse effect, as are fluorinated gases (which are synthetic).
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