Yes, there was a delay in effects during the 80s. I'm guessing that we can thank China for that. They pumped a shitload of SOx into the atmosphere. Some of it formed a high-altitude haze, which reflected enough sunlight to offset warming from increased CO2.

But China is releasing less SOx now. And it gets washed out of the atmosphere much faster than CO2 does. So the fit is hitting the shan now.