greenhouse gas - component of the atmosphere that absorb infrared radiation, isotopes - atoms of the same element with different number of neutrons, glaciers - Ice formed due to snow accumulation and compaction, anomaly - the difference between a reference value and an actual measurement, Arctic - Ocean with a layer of ice and surrounded by land, Antarctic - Continent with a layer of ice surrounded by water, ppm - number of molecules of a particular gas out of a million, carbon dioxide - CO2, methane - CH4, fossil fuel - carbon sources from plants and animals buried in rocks,

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