“know that if climate change is significantly man made” Im trying to understand how someone could possibly believe that it isn’t man-made at this point. I’m p

“know that if climate change is significantly man made” Im trying to understand how someone could possibly believe that it isn’t man-made at this point. I’m pretty sure this viewpoint would require the belief that atmospheric carbon and global temperatures are completely unrelated, which seems totally insane in late 2019. Maybe you can enlighten me?