Ah, I generally don't consider doubts of that nature (merely the magnitude of our effect being questionable) to qualify someone as a "climate denier", at least

Ah, I generally don't consider doubts of that nature (merely the magnitude of our effect being questionable) to qualify someone as a "climate denier", at least personally. I reserve it for the ones who call it a hoax, or say that warming trends are completely natural, or one of the many other easily refutable claims.