Mongabay: One half of the fish caught in the U.S. annually–and almost a third worldwide–come from the Bering Sea. Yet, this vast resource is increasingly threatened by climate change. A recent study, published in Marine Ecology Progress Series, showed that global warming will greatly affect the Bering Sea’s phytoplankton, the cornerstone of the sea’s rich ecosystem. "It’s all a good start that people get worried about melting ice and rising sea levels. But we’re now driving a comprehensive change …