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Abstract: The Chinese-Russian Oil Pipeline (CROP), from Mohe to Daqing has a length of about 965km and traverses the Da Hinggan Mountains and part of Song(hua)-Nen(jiang) Plain in Northeastern China. This paper attempts to estimate some of the important elements concerning the environmental hazards and contingency plans along the pipeline. The first part reviews the potential impacts of the Mohe-Daqing Pipeline on the cold regions environment. It includes 1) the major environmental characteristics such as complicated permafrost, rugged terrain, harsh weather, and the diverse flora and fauna, vegetation the pipeline passes through; 2) the consideration of route selection; 3) potential environmental impacts of the CROP on the environmental factors; 4) countermeasures to alleviate changes to the local environment during the design, construction and operation stages. The second part presents the risk of oil spills, the subsequent environmental challenges after the start of operation of CROP, and contingency plans in response to potential oil spills. [Copyright &y& Elsevier]