Nature World: Large butterfly populations in the UK could become extinct by 2050 due to severe droughts, according to a study published in Nature Climate Change. Dr. Tom Oliver of the U.K.'s Centre for Ecology & Hydrology (CEH) led the study, working with colleagues from CEH, Butterfly Conservation, Natural England and the University of Exeter, according to a release. Despite their predictions, the researchers also noted that better landscape management and greenhouse gas emission reductions could save large...