NASA has an excellent page summarizing the key practical uncertainties about climate change. A fine place to rebut the idea that anyone is claiming "the science is settled", and in aggregate showing how many of the uncertainties pull in the direction of greater impact and more dangerous outcomes.
They also lead in with a big and gorgeous image of the Sun, which I copy here 'cause it matches my color scheme and stuff. Here's their caption:
Extreme Ultraviolet Imaging Telescope (EIT) image of the sun with a huge, handle-shaped prominence, taken in 1999. While there is no evidence of a change trend in solar output over the past half century, long-term changes in solar output are not well-understood.