ANCHORAGE, Alaska — Anyone who doubts the gravity of global warming should ask Alaska's Eskimo, Indian and Aleut elders about the dramatic changes to their land and the animals on which they depend. Native leaders say that salmon are increasingly susceptible to warm-water parasites and suffer from lesions and strange behavior. Salmon and moose meat have developed odd tastes and the marrow in moose bones is weirdly runny, they say. Arctic pack ice is disappearing, making food scarce for sea animals and causing difficulties for the Natives who hunt them. It is feared that polar bears, to name one species,...