>>has anyone attempted to subtract the solar cycle variation from the temperature data?
Any correlation that might have existed between solar activity and temperature started to diverge over 30 years ago:
"Over the last 30 years of global warming, the sun has shown a slight cooling trend. Sun and climate are going in opposite directions. This has led a number of scientists independently concluding that the sun cannot be the cause of recent global warming.
One of the most common and persistent climate myths is that the sun is the cause. This argument is made by cherry picking the data - showing past periods when sun and climate move together but ignoring the last few decades when the two diverge."
