«Data from the Met Office shows that the long -
term rate of global warming has now returned to the level seen in the second half of the 20th century.»
Not exact matches
Schneider's approach to climate policy, comes up during a discussion
of the enduring uncertainty surrounding the most consequential aspects
of global warming, particularly the near -
term rate at which sea levels will rise as ice sheets melt and seawater
warms.
This single pattern has a long -
term global warming rate of 0.06 deg C per decade and an oscillation due to ocean cycles (http://bit.ly/nfQr92)
of 0.5 deg C every 30 years as shown in the following two graphs.
So I asked Mr. Knappenberger to test the models» agreement with long -
term observations using a new «third» scenario in which internal variability once again «enhances» the «externally forced trend» and
global warming resumes at the 1984 - 1998
rate of 0.265 ºC / decade.
I'm not for a moment suggesting this makes
global warming go away, only it might slow the
rate of change down - a bit - in the short
term (perhaps the average transit time
of deep currents).
Considering all the short -
term factors identified by the scientific community that acted to slow the
rate of global warming over the past two decades (volcanoes, ocean heat uptake, solar decreases, predominance
of La Niñas, etc.) it is likely the temperature increase would have accelerated in comparison to the late 20th Century increases.
Santer et al. also debunked the «skeptic» myths that
global warming is just due to internal variability, and that a short -
term slowing in the
rate of warming means
global warming has magically stopped.
Look close - indeed there are at least 12 previous presidential
terms that experienced
global warming rates (a.k.a., acceleration) greater than anything experienced over the last 6.5 years
of Obama's administration.
The planet's deep oceans at times may absorb enough heat to flatten the
rate of global warming for periods
of as long as a decade even in the midst
of longer -
term warming, according to a new analysis led by the National Center for Atmospheric Research (NCAR).
The statistics say that since 1970, there has been no change in the
global warming trend, and all the fluctuations in short
term rates of change are due to noise.
The current
rate of global warming, faster than any observed in the geological record, is already having a major effect in many parts
of the world in
terms of droughts, fires, and storms.
First, the chart on the right represents satellite short and long -
term acceleration plots used in the prior article; the chart
of the left plots the short and long -
term warming per century acceleration
rates derived from the HC4 land / sea
global dataset.
While the
rate of global warming has slowed in the past several years, possibly due to natural climate variability, the long -
term temperature trend clearly shows that we're living on a
warming planet.
[WWF have claimed that the long -
term costs could be offset by energy savings in all areas, but this appears to be based largely on wishful thinking and, at any
rate, no discounted cash flow analysis was made to include the investment cost, nor was any estimate provided for the amount
of global warming that would be averted.]