Really, get better information. Some crap-ass graph art is not convincing of anything other than the idiocy of those who produced it.
A misleading graph purporting to show that past changes in Greenland’s temperatures dwarf modern climate change has been circling the internet since at least 2010.
Based on an early Greenland ice core record produced back in 1997, versions of the graph have, variously, mislabeled the x-axis, excluded the modern observational temperature record and conflated a single location in Greenland with the whole world.
The isotope data stops in 1855 due to warming effect corruption of the near surface layer that would theoretically cover 1855 to 1997 when the
data was published. And the warming only kicks in after 1980. All you see in that misleading graph is the expected interglacial pattern of
slowly decreasing isotope anomaly (page 20 in the PDF).
We do not need ice cores for the last 100 years since we have actual temperature measurements. These actual temperature measurements
that have enough spatial coverage to be meaningful show a rapid temperature increase beyond any climate relevant variability over the last 500 years.
Using 50,000 year old conditions as some reference state is BS since that was a 180 ppmv climate. Instead of falling back to 180 ppmv as has been
the pattern over the last 3.3 million years from interglacial maxima of 320 ppmv, we hare already at 410 ppmv of CO2. That is a measurement
based number. The last time we saw 420 ppmv CO2 was when the Panama channel closed leading to an isolation of the Atlantic and Pacific Ocean
basins. This led to a de-gassing of CO2 which increased temperatures before the system settled into the ice age of the last 3.3 million years.
I it gets tiresome of politically motivated BS about how CO2 does not control climate. The fuck it doesn't. N2, O2 and Argon are transparent
to infrared radiation and they account for 99.999% of the atmosphere. Without actual IR absorbers like CO2, CH4, N2O, NOx, and O3 the
Earth would be an ice hell. Since H2O is not a dry gas at any temperature range we have on this planet (unless you think over 100 C is normal)
it requires dry greenhouse gases to maintain it in vapour form. Removing the trace greenhouse gases and supposing that H2O existed in sufficient
concentrations to maintain the temperature of today, we would see a pattern of progressive precipitation removal. At high latitudes in winter
the falling out of snow would rapidly drop the temperature below anything we see today since dry air is not effective at trapping IR. Super
cold winter temperatures would form high snow and ice albedo that would reduce solar surface heating (shortwave absorption by the ground)
and give a glaciation process on steroids. High albedo conditions would be cumulative year to year. But the atmospheric H2O vapour removal
at high latitudes would not even be balanced by low latitude evapouration since the cold temperatures would migrate towards the equator.
Without IR trapping, the surface would get warm but the air would only be warmed by convection. But the high latitude glaciation would
push towards the equator and we would have the Snowball Earth regime we already had on this planet when the Sun had less output. The
only way that the system escaped these regimes in the past was through the accumulation of CO2 from volcanic emissions and the lack
of the ocean CO2 sink due to sea ice cover (CO2 gets absorbed in cold waters and released in warm waters).
So in summary,
1) The graph is not even showing what you think it shows. There was no warming before 1855.
2) Natural variability is an ignorant excuse. Especially when it is referenced to 50,000 years ago or millions of years ago. At no
time over the last 15,000 years did we see the temperature change that we are seeing evolve between 1950 and today. Rapid
albedo changes due to interstadials are not any proof of intrinsic variability, they are deterministic and depend on the glaciation
conditions of the time. There is no way in hell that a Laurentide ice sheet can form today in a few years. But during those
interstadials the ice sheet was still there.
3) The radiative transfer effect of CO2, CH4, and other greenhouse gases is not variable. It is laboratory confirmed science that
we understand without the need for any black box model. Unless you consider quantum mechanics to be BS.
4) You should thank your lucky stars that H2O is not a dry gas at life-supporting temperatures. Otherwise there would
never be any life in the first place. It is thanks to condensation of H2O that the primordial Earth managed to cool off fast
enough to form oceans and sequester the 95% of its atmosphere that was CO2 into carbonate rocks. Water acts as
an efficient heat pump today that regulates the global temperature by deep convection. Deep convection results in
latent heat release from condensation in the tropopause region where the the atmosphere starts to become optically thin
to IR. So we have the transport of surface heat to where it can more efficiently radiate to space. Get rid of the water
and the Earth actually would be like Venus.