Escape from Alaska.

A helicopter pilot work with a husband and his wife in the frozen North tagging foxes for the Environmental Protection Agency. When an avalanche hits the group, the husband is killed and only by the pilot's perseverance is the wife saved. Two years later, the wife takes on a corporation which wants to extend an oil pipeline across the tundra above Juneau. She is convinced that this will cause an avalanche on the town. Of course, she is rejected by the corporation executives. She recruits the pilot to try to aid her, but with no success.