Spiegel: A new study has found that Europe’s fish are smaller than they have been in decades and the researchers believe global warming may be to blame. They warn that smaller fish could eventually have a domino effect on the food chain. European fish are getting smaller. Over the past two to three decades some varieties have lost almost half of their body weight. And while smaller fish now make up a greater percentage of all fish species, European fish stocks have also shrunk — by around 60 …