We have a long ways to go yet until Solar Activity Levels produce a net warming effect on Earth. Right now we are about half way to neutral. We had more activity then this back in March 2008. Sunspot activity is just one component of many. But basically, you do not get any net warming until you see a whole lot of black spots over the suns surface. In fact the latest prediction from NASA state that we will only have a short peak period of warming from cycle 24, and NASA has consistently predicted more activity then has actually occurred so far with cycle 24.