National Geographic: The Arctic has experienced some of Earth's first and greatest effects of climate change, but the icy lowlands around Hudson Bay have remained remarkably resistant to warming-until recently. A new study reports that, since the mid-1990s, aquatic ecosystems in one of the Arctic's last refugia have undergone dramatic climate-driven changes and appear to have reached an ecological tipping point.
While local temperatures had remained relatively steady before the last two decades, they've risen since...