Methane, Gas released due to melting permafrost, Eccentricity , Shape of the earth's orbit, Carbon Dioxide , Gas released from Volcanic eruptions , Precession, The wobble of the earth on its axil, Obliquity , Tilt of the earth, Volcanic Eruptions , Can cause global warming or cooling, Permafrost, Frozen organic matter, Sunspots, Occur in an 11 year pattern.

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