Carbon Dioxide and Earth's Future Pursuing the ... - Magazooms

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Hemisphere during the Holocene (Butikofer, 2007; Wanner et al., 2008; Wanner and Butikofer,
2008), or even been global (Mayewski et al., 2004).”
Ljungqvist also notes that “decadal mean temperatures in the extra-tropical Northern
Hemisphere seem to have equaled or exceeded the AD 1961-1990 mean temperature level
during much of the Roman Warm Period and the Medieval Warm Period,” and he says that “the
second century, during the Roman Warm Period, is the warmest century during the last two
millennia,” while adding that “the highest average temperatures in the reconstruction are
encountered in the mid to late tenth century,” which was during the Medieval Warm Period.
He warns, however, that the temperature of the last two decades “is possibly higher than
during any previous time in the past two millennia,” but adds that “this is only seen in the
instrumental temperature data and not in the multi-proxy reconstruction itself,” which is akin
to saying that this possibility only presents itself if one applies Michael Mann’s “Nature trick” of
comparing “apples and oranges,” which is clearly not valid, as discussed earlier in this report.
This new study of Ljungqvist is especially important in that it utilizes, in his words, “a larger
number of proxy records than most previous reconstructions,” and because it “substantiates an
already established history of long-term temperature variability.” All of these facts, taken
together, clearly demonstrate that there is nothing unusual, nothing unnatural or nothing
unprecedented about the planet’s current level of warmth, seeing it was just as warm as, or
even warmer than, it has been recently during both the Roman and Medieval Warm Periods,
when the atmosphere’s CO2 concentration was more than 100 ppm less than it is today. And
this latter observation, together with the realization that earth’s climate naturally transits back
and forth between cooler and warmer conditions on a millennial timescale, demonstrates that
there is absolutely no need to associate the planet’s current level of warmth with its current
higher atmospheric CO2 concentration, in clear contradiction of the worn-out climate-alarmist
claim that the only way to explain earth’s current warmth is to associate it with the greenhouse
effect of CO2. That claim -- for which there is no supporting evidence, other than misplaced
trust in climate models -- is unsound.
With respect to the recent rate at which the earth has warmed, we examine the results of a
number of studies that have investigated recent temperature changes in the Arctic, which
Meadows (2001) described as “the place to watch for global warming, the sensitive point, the
canary in the coal mine.” Here, in comparing the vast array of prior Holocene climate changes
with what climate alarmists claim to be the “unprecedented” anthropogenic-induced warming
of the past several decades, White et al. (2010) recently determined that “the human influence
on rate and size of climate change thus far does not stand out strongly from other causes of
climate change.”
Other scientists preceded White et al. with similar conclusions. Chylek et al. (2006) studied two
century-long temperature records from southern coastal Greenland -- Godthab Nuuk on the
west and Ammassalik on the east -- both of which are close to 64°N latitude, concentrating on
the period 1915-2005. And in doing so, as they describe it, they determined that “two periods
of intense warming (1995-2005 and 1920-1930) are clearly visible in the Godthab Nuuk and
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