I've sat on the beach and wondered about that.....saw some waves yesterday....and saw no ships....
The authors used a blend of seven recent reconstructions of Northern Hemisphere temperature over the past millennium to test the effects of long-term changes in brightness.
So they manufactured a fraudulent series of models to prove their preconceived notions. That is a completely manufacture propaganda statement. They have NO data to back that claim up at all. More fraudulent Junk Science propaganda. They just went out and stated their political propaganda as "Science" these are not scientists at all.