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University of Toronto Scarborough
Environmental Science
Carl Mitchell

Our environment is more then just our surroundings Environment is the sum of our surroundings It includes all of earths o Biotic Components (Living Things) Biotic Constituents = Animals, plants, soil, forests, people occupying landscape o Abiotic Components (Nonliving things) Abiotic Constituents = Continents, oceans, clouds, rivers, icecaps In the most inclusive scene, our environment includes scientific, political, ethical, economical, and social relationships & institutions. It is the interactions that characterize environment. Most people equated environment with wilderness. Environment Canada is to preserve and enhance the quality of Canadas natural environment, conserve our renewable resources and protect our water resources. Environmental science explores interactions between humans and the physical and biological world We depend on the environment for air, water, food, shelter, and everything else essential for living. Some actions have enriched our lives, bringing us longer life spans, better health o Some have damaged natural systems that sustain us Water & air pollution, soil erosion etc. Environmental Science is the study of how the natural world works, how our environment affects us, and how we affect our environment. o It is important to understand our interactions and our role in the environment. Natural resources are vital to our survival Islands are finite and have limitation in material resources Renewable Natural Resources are natural resources that are relenishable over short periods (wind, wave energy, sunlight. o Become non-renewable if we use them at a rate that is faster at which they are renewed or replenished. Resource Management is a strategic decision making and planning aimed at balancing the use of a resource with its protection and preservation. o Balance the withdrawal from the stock with the rate of renewalregeneration o Stock is the harvestable portion of the resource Stock-and-flow resources highlight the importance of the balance Non-Renewable Natural Resources are finite supply & depletable as they are formed much more slowly (fossil fuels, mineral deposits.) o Once we use them up they are no longer available. o Fossil fuels & minerals are mined rather than harvested, therore once extraction becomes inefficient to be profitable they move on to new sites. Management of non-renewable mineral resources demands conservation, reuse & recycling. o Other resources are truly non-renewable and nonreplenishable (once a species has become extinct it wont return) o A key question in managing resources is to look at the resource of interest or to look at the environmental system and how to avoid damaging the system and sustain the availability of the resource in the long term. Important to preserve for the future, recently the consumption of natural resources has increased greatly. Human population growth has shaped our resource use Four significant periods of societal change appear to have triggered remarkable increases in population size. o 1. The paleolithic (stone age) period > humans gained control of fire and began to shape and use stones to modify their environment
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