No what that ice core study showed was that the temp changed by as much as 10degrees in less that 10 years
It does not prove what you claim.
You need to read more on the subject, as you don’t know enough to realise you are wrong
Ice core study can’t show temperature
scientists cannot directly measure temperatures from ice cores, they have to rely on measuring the oxygen isotope –
18O – which is correlated with temperature, but imperfectly so.
A temperature reconstruction using the Greenland Ice Sheet Project 2 (“
GISP2”) ice core was first published by
Prof Kurt Cuffey and
Dr Gary Clow in a
1997 paper published in the Journal of Geophysical Research: Oceans.
Prof Richard Alley of
Penn State University also used the record in a
2000 paper. Neither of these papers provided a comparison of GISP2 record with current conditions, as the uncertainties in the ice core proxy reconstruction were too large and the proxy record only extended back to 1855.
The GISP2 ice core record was used in a number of papers in the late 1990s and 2000s that examined changes over the last ice age and the start of the current warm era – the Holocene – around 11,000 years ago. Around 2009, it caught the attention of
Dr J Storrs Hall of the
Foresight Institute, a technology-focused nonprofit group, who wrote a
blog postsuggesting that it disproved the idea that “human-emitted CO2 is the only thing that could account for the recent warming trend”.
That post was
republished on a climate sceptic blog called
Watts Up With That, which followed up with
its own version of a GISP2 graph in late 2010 by
Dr Don Easterbrook, an emeritus professor of geology at the
Western Washington University. Easterbrook’s graph, shown below, was shared widely across the internet by climate sceptics and is still
frequently seen – with
many small variations – to this day in discussions on Twitter, blogs and news article comment threads.
The temperature variation is believed to be caused by transport of heat in the ocean, it’s regional and doesn’t prove global temp change.