[OE] MS of ice floe on the Mackenzie River, with mountain range in background. MSs of ice packed on river bank. CS of ice block slowly melting in the sunlight, dripping into water. CS, TILT DOWN along slowly melting ice block. MS of ice floe moving downstream in middle of river, cut to MCS of same. AERIAL SHOTs of Mackenzie River, partly covered with ice. Two circular AERIAL PAN SHOTs of Mackenzie River Delta partly covered with ice. Several AERIAL SHOTs of Mackenzie River and tributaries partly covered by ice.