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دانلود رایگان کتاب GIS,Environmental Modeling and Engineering

    دانلود رایگان کتاب  GIS,Environmental Modeling and Engineering


That we are capable of destroying our life support system is beyond doubt. As a species, we have already been responsible for a considerable number of environmental disasters. If I scan the chapter titles of Goudie’s (1997) The Human  Impact  Reader,  the  list  becomes  long  indeed,  including  (in  no  particular  order):  subsidence,  sedimentation,  salinization,  soil  erosion,  desiccation,  nutrient  loss,  nitrate  pollution,  acidification,  deforestation,  ozone
depletion, climate change, wetland loss, habitat fragmentation, and desertification. I could go on to mention specific events, such as Exxon Valdez, Bhopal,  and  Chernobyl,  but  this  book  is  not  going  to  be  a  catalog  of  dire issues accompanied by finger-wagging exhortations that something must be done

The cosmological event of the Big Bang created the universe and in so doing space–time emerged (some would say “switched on”) as an integral aspect of gravitational fields. Space and time are closely interwoven and should more properly be thought of as a four-dimensional (4D) continuum in which time and space, over short durations, are interchangeable. Nevertheless, we conventionally think of separate one-dimensional (1D) time and three-dimensional (3D) space. The terrestrial space on which we live, the Earth, is at least 4.5 billion years old and has been around for about 40% of the time since time began ….

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