If the strongest criticism they can come up with about scientists is that they may be partly funded by an oil company, then those scientists don't have much to worry about.
Consensus is the stuff of politics, not science. The fact is, precious little is known about the dynamics of the atmosphere.
Have a look at the following recent articles from the BBC,
Here and
Here.
They simply don't know the dynamics of water vapour, which is a major component of the thermal behavour of the atmosphere. The theory is that the small amount of warming from CO2 is amplified by the positive-feedback effect of water vapour, but this simply cannot be the case. If that were true then life on earth would not exist. The radiation absorbed by water vapour in current concentrations is enough, by itself, to give us an average temperature of around seventy degrees celsius, so the feedback effect must not only be negative, but very strongly so.
Take away the supposed positive feedback and you're left with a very miniscule warming, which isn't going to increase significantly regardless of CO2 concentrations. The reason for this is that CO2 absorbs IR in a very narrow band between 13 and 17um, and this is already very close to saturation - ie radiation in this band is already being virtually fully absorbed by CO2 at current concentrations. And that wavelength of radiation is strongest in the coldest parts of the planet, being the dominant wavelength of black-body radiation at a temperature of minus eighty degrees celsius (according to Wien's law)
The facts of CO2 absorption have been known for over a hundred years, and for most of that time this was regarded as a mere scientific curiosity. It's only when the current GW scare started that it gained a quite undeserved prominence.
With so little actually known, what's surprising is that there are any scientists who are anything but highly skeptical.