Environmental history mainly focused on the interaction between humans arid nature in the ? past. Thus, this interdisciplinary study is very vital in this dramatically changing world. Different r historians and concerned bodies of the field produced different research works during the last three or four decades. However, The Ethiopian historiography pertaining to environmental history has been insignificant due to the new emerging discipline Therefore the main purpose of /he thesis is to examine the historical outline of the environmental history of Dajan Warada in the twentieth century. T!Je main focuses of the study are the causes and impacts of environmental· change as well as the response of the society to mitigate the deteriorated environment and minimize the effects of the change. The Warada was one of the surplus producing region in ... Gojjam and agreeable to animal rearing. Plagues of locust and out brake of cattle and-human transmitted disease have occurred frequently in the 'district in the century. Dejen was ideal place for the outbreak of locust and other plant disease including malaria in the Tow gorge of Abby bar. The major factor for the severity of environmental change in the district was population pressure, deforestation, soil erosion land tenure system, Jack of modern land management system, traditional agricultural system, government policies like villegizetion, Agricultural Producers Association and the introduction of fertilizers intensively specially after the establishment o[ Peasant Association, Due to these factors the environment considerably changed especially in the last three decades. The most important consequences of environmental . Abstract change in the study area were growing crisis in wild animal, energy and wetland, decline of agricultural productivity due to crop failure and frequent occurrence of drought as well as other natural disasters like land slid. As result seasonal migration is common in the district due to dissatisfaction of their life. Therefore, the impacts of environmental change negatively affected the livelihood of the people. Different traditional and modern mitigation measures were taken to improve the problem such as a forestation by food for work project community forest to overcome the problem of environmental degradation in the study area. The government also established responsible government organ to mobilize and organize to alleviate the problem .. However, the attempt of all responsible agents in collective was not equivalent to intensity of natural resource degradation. -