Study: Earth's Roughly Warmest In About 100,000 Years

Snyder's temperature reconstruction, published Monday in the journal Nature , doesn't estimate temperature for a single year, but averages 5,000-year time periods going back a couple million years. Snyder based her reconstruction on 61 different sea surface temperature proxies from across the globe, such as ratios between magnesium and calcium, species makeup and acidity. Temperatures averaged out over the most recent 5,000 years — which includes the last 125 years or so of industrial emissions of heat-trapping gases — are generally warmer than they have been since about 120,000 years ago or so, Snyder found. [...] two interglacial time periods, the one 120,000 years ago and another just about 2 million years ago, were the warmest Snyder tracked. Scientists give various reasons for past changes in carbon dioxide and heat levels, including regular slight shifts in Earth's orbital tilt. Shakun called it unrealistic and not matching historical time periods of similar carbon dioxide levels.

Topics:  nature   snyder   temperatures   scientists   shakun   earth's   warmest   years   periods   time   reconstruction   dioxide   carbon   levels   million   
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