The Arctic Environment is one of the "Lost Keith Brothers" supplements published by Cargonaut Press for use with Classic Traveller. In the same vein as The Desert Environment, The Mountain Environment, and The Undersea Environment, this item adds rules, equipment, and encounters for cold weather adventures.
From the back cover:
"The Arctic Environment is a Traveller supplement dealing with the particular hazards and special situations of travel and survival in sub-zero climates. Included are specific rules designed to simulate arctic weather conditions, explanations of equipment of use to characters venturing into an arctic clime, and a guide to the special events and encounters which may take place under arctic conditions."