Polar bears drowning in an Alaskan sea because the ice packs are melting—it’s the iconic image of the global warming debate. But the validity of the science behind the image—presented as an ignoble testament to our environment in peril by Al Gore in his film An Inconvenient Truth—is now part of a federal investigation that has the environmental community on edge. Special agents from the Interior Department’s inspector general's office are questioning the two government scientists about the paper they wrote on drowned polar bears, suggesting mistakes were made in the math and as to how the bears actually died,...