Agence France-Presse: Climate change has caused a flock of wild sheep on a remote northern Scottish island to become smaller, according to an unusual investigation published on Thursday. The study explains a mystery that has bedevilled scientists for the past two years. The wild Soay sheep live on Hirta, in the St. Kilda archipelago in the storm-battered Outer Hebrides, and have been closely studied for nearly a quarter of a century. The law of evolutionary theory says the brown, thick-coated …