That may be so, to be honest I'm not sure. That said we know that we're gathering data "as it happens" and that the size of the cycles mean that this is the first time we've been recording data at this point in any cycle.
You mean that we have no idea whether these are cycles, or random variation, or something in between?
If it's the first time it's being recorded, it cannot be stated with certainty that it's a cycle. One would need at least three repetitions, and even that wouldn't be particularly statistically valid unless one had a pretty solid grasp on the underlying mechanism.
Tying it into sunspot and solar cycles would probably do that, but then that would shift the emphasis off carbon dioxide as a driver and back onto the sun. Which really should be the prime suspect anyway; ask any child why it's hot and they'll point to the big ball of fire in the sky. That's the null hypothesis, imo.
It's beyond doubt that human-made carbon emmissions are having an additive effect regardless of the larger cycle, surely?
It surely is. Adding things into a system causes changes in the system.
The scale of that effect is fairly relevant and open to debate though. If the effects of anthropogenic emissions happened to be 6 orders of magnitude below, say, solar effects, then there would be no point getting our panties in a bunch over.
You wouldn't worry about leaching a couple of parts per million of lead into the water supply if just downstream someone was pumping one part per thousand of cadmium in. Sure, the lead makes it worse, and you'd want to control it in the long term, but it's hardly cause for immediate alarm. I'm not saying that this is necessarily the case, but I haven't seen a strong case made for eliminating other variables as additional causes.
Add into that the debate over whether carbon dioxide is a cause or an effect of warming, and it starts becoming very unclear indeed. It's possible that atmospheric CO2 is little more than an indicator dial on a fairly complex system that is controlled by other things entirely.
For example, having steam in the radiator doesn't cause a car to overheat in and of itself, the car overheats for other reasons, which then causes steam in the radiator as a byproduct. Adding a little tea kettle that fed steam into the radiator (probably) wouldn't really do anything under normal conditions, because the system is designed to deal with heat and has feedbacks that bring it back to normal. The equilibrium would change abit and the whole car would run a little hotter, but unless something was seriously wrong with the car you still (probably) wouldn't actually overheat anything.