LOL..
If the other planets are warming at the same rate as the earth, which the paper clearly states it is, then the warming is not caused by what we are doing. It is being caused by a COMMON EXTERNAL FORCE called THE SUN...
There are going to be some mighty upset warmers in here real soon...
Two of the items that no current GCM takes into account are changes in the earths atmospheric depth and another is the changes in the spectral output of the down-welling solar radiation. A recent paper looks at this very question.
Abstract:
"
We have identified a sample of 33 Sun-like stars observed by the International Ultraviolet Explorer (IUE) with the short-wavelength spectrographs that have ground-based detections of chromospheric Ca ii H+K activity. Our objective is to determine if these observations can provide an estimate of the decrease in ultraviolet (UV) surface flux associated with a transition from a normal stellar cycle to a grand-minimum state. The activity detections, corrected to solar metallicity, span the range $-5.16\lt \mathrm{log}{R}_{{HK}}^{{\prime} }\lt -4.26$, and eight stars have log ${R}_{{HK}}^{{\prime} }\lt -5.00$. The IUE-observed flux spectra are integrated over the wavelength range 1250–1910 Å, transformed to surface fluxes, and then normalized to solar B − V. These normalized surface fluxes show a strong linear relationship with activity ${R}_{{HK}}^{{\prime} }$ (R 2 = 0.857 after three outliers are omitted).
From this linear regression we estimate a range in UV flux of 9.3% over solar cycle 22 and a reduction of 6.9% below solar cycle minimum under a grand minimum. The 95% confidence interval in this grand-minimum estimate is 5.5%–8.4%. An alternative estimate is provided by the IUE observations of τ Cet (HD 10700), a star having strong evidence of being in a grand-minimum state, and this star's normalized surface flux is 23.0 ± 5.7% lower than solar cycle minimum."
source
As you can see, a UV decrease of almost 9% is expected and will last 60-90 years. This will cause massive cooling of the oceans all by itself. If the solar wind stays low, the increased equatorial atmosphere will cause further loss of energy to the oceans. We could see upwards of a 12-14% drop in the UV spectrum, at sea level, from our sun for a prolonged period of time. The loss net effect of 4.1-6.8 W/m^2.
We are in for some serious cooling. Let us hope that the sun doesn't go to sleep and stay asleep for 90,000 years before it becomes active again. We still don't know the primary causes of our Glacial Cycles but this could very well be the cause.
The current warming of our solar system will be short lived as this reduced output state is going to last a long while.