46. Two natural factors that have been proposed to cause climate changes over the past few decades to centuries (i.e., the Little Ice Age and Medieval Climate Anomaly) are: (A) variations in the Earth's orbit and CO2 (B) the rock cycle and changes in the Sun's strength (C) the sea ice feedback and changes in the Earth's orbit (D) changes in volcanic aerosols and the strength of solar output (irradiance)

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