How we know that the sun changes the Climate. Part I: The past

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How we know that the sun changes the Climate. Part I: The past

by Javier Vinós Part I of a three part series. The Sun is a variable star and the amount of energy it emits varies from month to month, year to year, and century to century. One of the manifestations of these variations are sunspots, which are more common when the Sun is more active and disappear when it is less active. These spots follow a solar cycle of about 11 years, but sometimes there is a longer period, decades or centuries, when the Sun…