Even when the landscape is covered in snow, there are a few easy principles you can follow to minimize your impact on the environment.
Even though the nights are cold and long, try to resist the urge to have a campfire. During winter, when all downed wood is buried under the snow and the only available fuel is tree branches, fires are a bad idea. As a “warm glow” alternative, bring plenty of fuel for your stove and try candle lanterns.
Upon leaving camp, dismantle your snow shelter and fluff up the white stuff so that visitors coming after you can enjoy a natural setting.