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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: i-node who wrote (936465)	5/23/2016 6:37:05 PM
From: Wharf Rat	Respond to of 1577020

"start with explaining why temperature isn't 150." We haven't been hit by a large flying object in several billion years, we're too far from the sun, and we've never had enuf carbon to get that warm. = What's the hottest Earth's ever been? Following the collision that spawned the Moon, the planet was estimated to have been around 2,300 Kelvin (3,680°F). Even after collisions stopped, and the planet had tens of millions of years to cool, surface temperatures were likely more than 400° Fahrenheit But suppose we exclude the violent and scorching years when Earth first formed. When else has Earth’s surface sweltered? Temperatures rose significantly near the end of the Neoproterozoic, perhaps reaching a global average higher than 90° Fahrenheit. (Today's global average is lower than 60°F.) During the PETM, the global mean temperature appears to have risen by as much as 5-8°C (9-14°F) to an average temperature as high as 73°F. (Again, today’s global average is shy of 60°F.) At roughly the same time, paleoclimate data like fossilized phytoplankton and ocean sediments record a massive release of carbon dioxide into the atmosphere, at least doubling or possibly even quadrupling the background concentrations. climate.gov = "While there could be such a correlation, there could well be correlation with exogenous factors that aren't considered because there are other covariant data points." Suppose you give us examples of factors not considered. I'll get you started. Yes, the Milankovitch cycle is included in the models. Figure 3: Percent contributions of various effects to the observed global surface warming over the past 50-65 years according to Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), and Gillett et al. 2012 (G12, orange). Figure 4: Percent contributions of various effects to the observed global surface warming over the past 25-30 years according to Meehl et al. 2004 (M04, red), Lean and Rind 2008 (LR08, purple), and Foster and Rahmstorf 2011 (FR11, green). = If you want to look at the last 20 years or 30 years, go for it." Put some paper over the years between 1900 and 1980.