I see where you're coming from. When it comes to climate models, lots of feedback loop, both positive and negative ones, are being thrown around - you can basically adjust models arbitrarily to your political liking. Adjusting these models to real data is a never-ending process as long as we don't have the computational power to both resolve much denser grids and timesteps and include more parts of the equation than we do now. However, when it comes to balancing these things out to give an accurate prediction, I tend to trust organizations like NASA, IPCC and NOAA over the typical right wing think tanks that you see throwing together these denialist reports. Yes, we do know about negative feedback loops, the scientific consensus is just that they're much weaker than what we're doing to the atmosphere. Also, the 1998 measurement that gets thrown around is very misleading - have a look at [1].
Noone is claiming these models are perfect and the temperature increase estimates may be off by some margin - all I'm saying is that as long as we're sure current CO2 levels aren't going to kill our future, we better stop increasing them, given scientific consensus. When the doomsday scenarios come from scientific studies and stop including low probabilities, it's better to take them seriously rather than bet our home planet on them being all wrong.
I don't trust the IPCC because the actual results haven't matched their models, regardless of what the "scientific consensus" is on negative feedback loops.
And again, stopping the increase of CO2 would require massive global emissions cuts, which would require a new energy infrastructure.
Noone is claiming these models are perfect and the temperature increase estimates may be off by some margin - all I'm saying is that as long as we're sure current CO2 levels aren't going to kill our future, we better stop increasing them, given scientific consensus. When the doomsday scenarios come from scientific studies and stop including low probabilities, it's better to take them seriously rather than bet our home planet on them being all wrong.
[1]http://www.nasa.gov/topics/earth/features/upsDownsGlobalWarm...