Yes, obviously habitat destruction, chemical exposure, etc. are bad. But the sudden, broad emergence of a new set of symptoms means that something new is happening besides business as usual.
In this scenario, saying "habitat destruction" and leaving it at that is like a coroner saying "cause of death: stopped being alive." It's true, but not useful.
In this scenario, saying "habitat destruction" and leaving it at that is like a coroner saying "cause of death: stopped being alive." It's true, but not useful.