from memory it was ~3800 independent scientists over many years of study ,from every continent, whose findings led to the original theseus of 'global warming '.
I find it comical whenever this is 'debated' by those whose 'study' of climatology is merely parroting the odd stooge for an ancient industry or , better still, googling for a 'research'.
Do a ph.d. in ...anything....and THEN tell me how it all is.
