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temperature is up - what caused it?
[[Image:158227main warm trend lg.jpg|right|thumb|temperature deviation from 1977 baseline]]
[[Image:158227main warm trend lg.jpg|right|thumb|temperature deviation from 1977 baseline]]
Global land-ocean temperatures have increased one and a half degrees Fahrenheit (0.8 degrees centigrade) in the last {{years since|1880}} years. Whether this represents a natural recovery from the [[Little Ice Age]] is hotly debated by liberals and conservatives; see [[global warming]].