Thousand-year reconstructions of: (top) Northern Hemisphere temperature change over time from Moberg et al. (2005), including the HadCRUT instrumental temperature record in red; and (bottom) relative climate forcing resulting from solar input, carbon dioxide, and aerosols in Watts per square meter from Crowley (2000). The climate has changed in the past in response to climate forcings, and recently the dominant climate forcing has become human-caused emissions of carbon dioxide and other greenhouse gases, mainly from burning fossil fuels.
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