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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