I have only waded as far as MrRoolmops first post - but felt it warranted a response.
In short, it's bolleaux. There is no allowance made in any of the climate models for the increased absorption of CO2 by trees and marine algae. They increase their metabolic rate in response to improved growing conditions. Why is this ignored, well reduced predictions equals reduced research funding equals reduced reasons for taxes equals reduced control of a gullible population who will fund governments to pursue the aims of the politicians etc. etc. etc.
Such things may not be in the first generation of climate models - but they are definitely being worked on by the next generation of models - not just the statistical ones but the physics/chemistry/biology based ones that try to understand the processes and use that to replicate past situations, and then build into predictive models.
I know this personally because I know a lot of people who are doing it. They are not particularly political animals - but they are beavering away in their little bit of the research and when you stand back from it and look at all the evidence - on balance it looks like there is at least a good chance that we (humans) are a large contributing factor in current changes.
Even it is wrong - it can't do us any harm at all to review our use of scarce resources and destructive activity and cut back on it. Modern humans as a general rule to very little to enhance our environment on any level - we would all benefit from curbing our behaviour a bit.
And bottom line with taxes - they go to fund (mostly) services that we all use - health, education, defence, infrastructure etc etc etc. Not paying taxes is not an option.
And just because the politicians and top managers have screwed up the initial response to tackling global warming with carbon trading and other economic tools, does not mean the underlying problem is not there and we should ignore it. It seems to me this is suffering from the general sceptism about politicians.
Sad that after years of trying to get the politicians to listen and understand what the scientific evidence suggests, that now that they are finally beginning to do that coincides with the time people think politicians are a bunch of lying schemers.