Temperatures, Sea Levels ‘Naturally’ Rise 30 ‚Äì 40 Times Faster Than Today’s Rates
Modern Temperatures Only Rising 0.05¬∞C/Decade
Since 1850, CO2 concentrations have risen from 285 ppm to 400 ppm. During these ~165 years, the IPCC has concluded that surface temperatures have warmed by 0.78¬∞C. This is a warming rate of only 0.05¬∞C per decade for 1850-2012 — which happens to be the same rate of warming over the 1998-2012 period.
IPCC AR5 (2013): “The globally averaged combined land and ocean surface temperature data as calculated by a linear trend, show a warming of 0.85¬∞C over the period 1880 to 2012, when multiple independently produced datasets exist. The total increase between the average of the 1850‚Äì1900 period and the 2003‚Äì2012 period is 0.78 ¬∞C, based on the single longest dataset available 4 (see Figure SPM.1). … [T]he rate of warming over the past 15 years (1998‚Äì2012; 0.05 ¬∞C per decade), which begins with a strong El Ni√±o, is smaller than the rate calculated since 1951 (1951‚Äì2012; 0.12 ¬∞C per decade).”
Modern Sea Levels Only Rising 0.17 Of A Meter/Century
IPCC AR5 (2013): “[T]he rate of global averaged sea level rise was 1.7 mm yr between 1901 and 2010“
Historical Hemispheric Temperatures Rose 2.0¬∞C/Decade
According to a new paper, the B√∏lling Warming event 14,700 years ago raised the surface temperature for the entire Northern Hemisphere by 4 to 5¬∞C within a few decades. This is a hemispheric warming rate of approximately 2.0¬∞C per decade, which is 40 times faster than the 0.05 ¬∞C per decade global warming rate since 1850 (and 1998).
Historical Sea Levels Rose 5.3 Meters/Century
Central Greenland’s surface temperatures rose by as much as 12¬∞C during this time frame (14,700 years ago to 14,500 years ago). Consequently, glaciers and ice sheets disintegrated rapidly and sea levels rose by about 18 meters (“12-22 m”) in 340 years. An 18 m rise in 340 years is the equivalent of 5.3 meters per century, which is more than 30 times faster than the rate of sea level change (0.17 m per century) between 1901 and 2010.