We were more than a little dismayed to read Garth George (Who
stands to gain?) on these pages last Friday week, write Otago
University researchers Doug Mackie, Hugh Doyle and Christina
McGraw.
We appreciate that few readers will have that issue of the
ODT to hand and so, rather than a line-by-line rejoinder, we
confine ourselves to generalities.
We have recently submitted a paper (to a leading journal)
that analyses the science in all 547 submissions (6662 pages)
made to both the New Zealand select committees considering
the ETS (the original Bill and the review).
We found that 86 submissions denied the truth of
human-induced climate change and made a total of 562
science-based claims (an average of seven claims per
submission).
However, there were just 19 unique types of claim.
Garth George uses the fourth most popular: what we called the
"not since" argument.
Here, climate is confused with weather and the claimant says
something like the slight warming that occurred between 1979
and 1998 has been followed by stasis and, since 2002, cooling
(this quote is from the submission made by a source cited by
George).
So what does this mean? Well, climate is long-term weather.
It is not valid to look at weather data for just a few years
and make such claims in the context of climate.
Look at the graph on the left for 1979-2008.
Sure enough, temperature is up and down but overall there
hasn't been much change.
Now look at the graph on the right for 1850-2008.
Here it is obvious that temperature has little wiggles but
these wiggles are superimposed upon an inexorable upward
trend.
This last week has been colder than it was in mid-September,
but that does not mean I expect it to be colder still in
February.
Want to know something really scary? Lags in the system mean
we have yet to experience the increase in temperature (and
other impacts like ocean acidification) that today's CO2
levels will cause.
However, our main point is that outright deniers are a
sideshow.
The real problem is the pernicious fast-follower meme: the
idea that we can afford to wait a few more years and then
take urgent action.
Imagine a boy-racer buying a modified Skyline turbo for
$20,000.
Probably not the wisest purchase in the first place, but
positively dumb if done on credit with only minimum
repayments being made.
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