The problem with using sun cycles is they are still poorly understood, since there are more cycles than have been identified. There are short cycles as well as long ones (which are the ones that are hard to ID. Then when you combine them you can get the same results as when you combine musical notes, when harmonics can give both increases in amplitude or they can nearly null out. So even if we did go through a cycle, the question remains - what other cycles did or are we going through.
It is the sun that is causing the current warming since temps on both Mars and Neptune have been rising.
Very interesting. If the temperature on other planets is rising in parallel with earth, that would be very convincing for the sun being the cause. Could you supply a reference for this?