Mother Nature Network: As our planet and our oceans warm, the habits and habitats of marine wildlife change, too. Fish, sharks and crustaceans that are normally found within a certain temperature range are forced to pack up and move. Why is that a big deal? Lots of reasons. In Maine, for example, lobster fishing is a $495 million a year industry. But fisherman are catching fewer lobsters (millions of pounds less each year), and the population is expected to continue to decline as these crustaceans migrate toward the cooler...