As a (poor) analogy, arguing whether or not it's human - caused feels a bit like planning to develop real estate on a seaside clifftop which some specialists have said might suffer
dangerous erosion in the next 70 years unless you put up some seawalls to prevent
water action at the base of the cliff - and basing your view whether to build seawalls and other
erosion defences upon whether or not there's proof that human activity would be the cause of any future
erosion, rather than whether or not
erosion is likely and if so how harmful it might be to your interests if nothing is done to reduce it.