Superb question, fairly stated, not grinding an axe. Starred.
I believe the major ORGANIZATIONS of scientists. They have to balance out the differing views of their members. If it's at all close, or scientifically uncertain, they'll simply refrain from taking a position as an organization.
They have all chosen to formally come down on the side of the mostly man made cause of warming. They include (my examples are the larger, more important ones, collectively representing tens of thousands of scientists):
The National Academy of Sciences, the American Association for the Advancement of Science, the American Institute of Physics, the American Chemical Society, the American Meteorological Association, the American Geophysical Union, the Nobel Prize Committee.
And many more (including the National Academies of every advanced country).
It helps that I find mainstream global warming scientists to be far more numerous, and their science more plausible. But if the same organizations said something I didn't agree with, I'd examine my personal views very closely, guessing that I was very probably wrong.