I don't disagree, but...
To say Climate science is and always has been our current best knowledge is exactly my point. The problem is when vested interests, either due to scientific funding constraints, or perhaps more worryingly political taxation schemes cause institutions which should be aiming to provide as unbiased as possible view of the world to withhold data from peer review etc.
It's really hard to actually give a historical analogy to this situation without sounding extreme, because what was probably cutting edge debate at the time now seems so utterly banal or frankly insane.
But - two examples spring to mind.
The first is a little spat between the papacy and Copernicus over whether or not the earth was the centre of the universe. Without getting into the philosophy of sophistric viewpoints, it now seems crazy to us to think that it could be seen as any other way than the Earth revolving around the sun.
The second is more relevant - relativity showed that the clockwork universe of Newtonian mechanics was a flawed model, and thankfully provided some of the solutions to the flaws. To quote an old physics adage - it might have been Feynman who said it, I can't be bothered to google it, "anyone who claims to understand relativity, doesn't" - it's complex, it's hard to explain, but it's right. The average Joe in the street will have heard of e=mc2, and will no doubt feel better for it, but won't be able to apply it, or understand the consequences of it.
Both of these examples apply to the climate debate, in that someone has proposed a model - it may be from conventional wisdom, it may be from an understanding created by only having access to part of the picture, but to actively attempt to discourage peer review, to attack through PR and media routes those who would disagree with it, and to not open up methodology and data to examination by other scientists, is malfeasance.
Your proposal is based on the idea that we now have to jump to correct any consequences of AGW, and that it's a safer bet to assume that AGW is happening than not.
I would argue that this is an opinion based on dogma, and that the data and the integrity of the body that produced/analysed it needs to be challenged. If it survives the challenge then I'm delighted, and will back the measures that are introduced to combat the emission of CO2.
On the other hand, if the data in inconclusive, it is a squanderous waste of money and resources to pursue that route.
They could be spent far more effectively on combating poverty, on improving the sanitation in third world countries, on curing disease. Changing the world is not impossible, but it's a question of what you want to tackle, and where the money and resources you have can be best spent.
I'm not a luddite - in fact I am very pro efficiency (which any greeny will agree is the best way to reduce carbon emmissions anyway). I'm very pro towards cutting pollution. But ultimately the atmosphere has been in long periods of higher temperatures than it has been today, just as we have experienced ice ages. It is a chaotic system, and attempting to impose order on a chaotic system is impossible in the long term.
Delightfully ironic as I feel saying it, sunshine is the best disinfectant. Get the data, and the methodology that has been used in "correcting" it, and lay it all out in the open. Let everyone have a look at it. Restore the integrity of the IPCC and the UAE by actually letting more than the selected sympathetic peers review it.
Until that is done, saying "the current best peer-reviewed evidence we have" is unfortunately a worthless prospect.
Shouting louder than another party, or attempting to cut them out of the debate, doesn't make what the IPCC and the UAE are saying right.
The one quote that came up from the leaked emails that rang so true, was the embarassment of the creators of the various climate models that showed large deviation from observed climatic behaviour just a few short years out from inception. To use them to predict out decades, or centuries, to grab sensationalist headlines, it's about as useful as trying to predict the stock market. And that's something which allegedly is in human control, if in a very widely distributed form.