Australian Broadcasting Corporation: Australian scientists say they have uncovered a “causal link” between the early emergence of a common butterfly and human-induced global warming. Dr Michael Kearney of the University of Melbourne and colleagues report their study on the butterfly Heteronympha merope in this week’s issue of Royal Society journal Biology Letters. “It’s now coming out about 10 days earlier than it was 60 years ago,” says Kearney. “When you look at the air temperatures over that time, it’s …