This volume presents an Inventory of Land Use and Land Use Practices in the Canadian Great Lakes Basin, with emphasis on certain trends and projections to 1980 (and to 2020 where appropriate). The Task B report for the Canadian part of the Great Lakes Basin is contained in five volumes: Volume I Canadian Great Lakes Basin Summary, Volume II Lake Superior Basin, Volume III Lake Huron Basin, Volume IV Lake Erie Basin, and Volume V Lake Ontario Basin. This volume, Volume I, is the Canadian Great Lakes Basin Summary report. The report integrates several studies by contractors and sub-contractors. These studies were part of the Canadian Task B effort for the Great Lakes Pollution from Land Use Activities Reference Group, International Joint Commission. This report describes and quantifies, as appropriate, the Canadian Great Lakes Basin's geology, soils, minerals, climate, surface and ground water, vegetation, wildlife, and economic and demographic characteristics. It inventories available information on waste disposal operations, lakeshore and riverbank erosion, high-density non-sewered residential areas and recreational land uses, as well as materials application of agricultural chemicals, fertilizers, animal wastes and salts on highways. Finally, future trends and projections are shown for the above categories.