@AC
>>"Their pet CAGW theory relies on solar influence being minor "
Does it really?
Surely, what they basically rely on is the fact that CO2 is a greenhouse gas, and the apparent fact that CO2 levels are being significantly raised by human activity.
It's fairly widely accepted that CO2 is a relatively minor factor in overall temperature, but that the other factors are relatively static, and it is argued that in normal solar conditions, CO2 above a certain level is likely to lead to results that we might not like.
Surely, in the limit that's pretty much accepted by everyone (few people would argue that a 100-fold rise in CO2 would be harmless), the question being what level of CO2 brings what kind of risk.
Unfortunately, there does seem to be a popular strand of unscientific argument that if CO2 effects are smaller than some other contributor, that means that it's safe to pretend that they don't exist at all - the desire among some people is not to understand the climate but to find an excuse to ignore the whole issue, just as some extreme environmentalists don't want to understand climate either but just want an excuse to argue that everyone should go 'back to nature'.
Even if the current solar situation had been predictable a decade or two ago, *and* we knew how long it was going to be before normal activity was resumed, it'd still make sense to ask what effect current human activity might have on a whole range of timescales.
Maybe it *would* be good for climate stability for the next few decades if we did burn shitloads more fossil fuels than we're currently doing, but even if that was the case, it'd be pretty stupid to ignore what longer-term effects there might be unless we were realistically confident we could engineer the problem away with ease when the time came.
>>"Should a maunder minimum type event result in temperatures decreasing then it means that the impact of solar changes is greater than the impact of CO2 changes and this would overturn pretty much all of the alarmists theories. It would also mean the +ve feedbacks from CO2 are small (or even -ve) and any possible increase in temperature from a doubling of CO2 would not cause a catastrophe."
That seems a bit of a shaky argument.
It seems to be like saying that if there was a room with some combination of thermal losses and heat sources, and that turning down a particular heater more than counteracted a certain claimed upgrade in the insulation, that would prove that even if the heater was turned back to normal, the room could never get too hot even if it was thought that the insulation would improve in efficiency over time.
The extent to which the room cools when the heater is turned down is interesting, but doesn't prove that the insulation doesn't exist as claimed unless the claim actually was that the insulation was so thick that it could cope with the reduction in input.
Who *has* actually claimed that current CO2 levels would prevent cooling with a significant decline in solar output?
When it comes to positive feedback mechanisms, aren't many of them postulated to occur at larger CO2 concentrations/higher temperatures than current ones, which means that looking at what happens in the near future doesn't do much to prove that such mechanisms wouldn't work?
If someone was saying that if the arctic gets to X degrees there'd be a huge methane release, that isn't proved wrong by nothing happening if/when temperatures decrease - it's only proved wrong if things warm up and still nothing happens.
>>"So in answer to your comment, there is no need for an off switch when solar activity ramps back up because, under the scenario presented, there would be nothing to switch off."
Only for people who believe bogus arguments such as "If solar output drops and current CO2 levels aren't enough to prevent significant cooling, that *proves* that even future higher CO2 levels can't cause undesirable warming when solar output is more normal."
Such arguments simply aren't science, they're sophistry.