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Environmental Science A Global Perspective


Environmental Science A Global Perspective Understanding our Environment Section 1.1 – PowerPoint PPT presentation

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Title: Environmental Science A Global Perspective

Environmental Science A Global Perspective
  • Understanding our Environment
  • Section 1.1

Environmental Science
  • Environmental Science study of how humans
    interact with their environment
  • Environment anything that surrounds us,
    including natural things as well as anything
    created by humans

  • Major Focus to solve environmental problems
    such as extinction or pollution
  • -often involves looking at the bigger picture
    such as economics and jobs
  • Age
  • - with respect to the other sciences (biology,
    chemistry and physics) it is quite new
  • - post WWII brought bigger cars and home
    appliances, farmland was used for homes, etc.
  • - the result was polluted rivers and lakes, smog
    and many other problems and with it a greater
    concern for the environment and the desire for a
    way to possibly save it.

  • Importance
  • -with respect to the other sciences it is quite
    possibly the most important.
  • -At no time in our history has an understanding
    of our environment been more important

Main Environmental Problems
Resource Depletion
  • Natural Resource any naturally occurring
    substance that can be used by living things
  • - some examples are sunlight, air, water, soil,
    minerals, animals and fossil fuels
  • - it is considered depleted when a large amount
    of it has been consumed

Resource Depletion
  • Nonrenewable resources any resource that cannot
    be replaced
  • - some examples are earth minerals and fossil
    fuels (in recent years there has been a lot of
    importance put on alternate fuels to slow the use
    of fossil fuels

Resource Depletion
  • Renewable Resources any resource that is
    continually replaced
  • - solar power is continually being replenished
  • - trees are a renewable resource but are an
    example of a resource that must be taken care of
  • - for example the rain forest is continually
    being cut down faster than new trees can grow

  • Pollution introduction of chemicals or waste
    material into an environment that is at a harmful
  • Pollutants some are by products of daily
    processes. For example nitrous oxides and heat
    energy are by products of fuel combustion
  • - others such as pesticides are both helpful and
  • - some are just direct results of human
    ignorance such as the dumping of poisonous
    chemicals in rivers and lakes

  • Extinction members of a species have died and
    the species is gone forever
  • - scientists estimate that thousands of species
    are becoming extinct every year, some without
    even being named or studied
  • - one response is an endangered species list
    which lists species that are at risk for
  • - scientists say that species are going extinct
    at a greater rate now than at any other time in
    Earths history
  • - one possible cause is the loss of their
    habitat due to humans building into forests

Global Perspective
  • - Sulfur dioxide from power generating plants in
    the american mid-west result in acid rain in
    Canada and the northeastern US
  • Pollution from automobiles in North America and
    Europe are putting more CO2 in the atmosphere
    which is believed to be one of the major causes
    of the worlds climate change
  • Destruction of the tropical rain forest is also
    contributing to the increase in CO2 in the
  • All these issues effect the biosphere

  • -Extends 8km above and 8 km below the sea level
  • - All living things exist in this area

Developed and Developing Countries
  • Developed country highly industrialized
    countries in which the citizens have high average
    incomes, health care and education systems
  • - major countries are USA, Canada, Japan,
    Australia, New Zealand and the western European

Developed and Developing Countries
  • Developing country less industrialized and the
    citizens have a much lower average income
  • - the economies in developing countries vary
    greatly depending on their ability to sustain

Population and Consumption
  • Many of the earths environmental problems can be
    linked to increase population growth or increased
    demand on human consumption
  • Population crisis human population is growing
    faster than the region can support
  • Consumption crisis when humans use up, waste or
    pollute the resources quicker than they can be
    replace or renewed

Population and Consumption
  • Population crisis - basically exists in
    developing countries. Even though there isnt
    enough resources the population continues to grow
  • - because there isnt enough resources the
    people overuse the resources by driving animals
    to extinction, cutting down forests for farmland
    and farmland is overused.
  • - Health issues are a great concern

Population and Consumption
  • Consumption crisis exists mostly in developed
  • - population is growing slowly and the citizens
    have a disproportionate share of the earths
  • - due to their disposable income they tend to
    overuse the resources or over pollute
  • - developed countries comprise about 20 of the
    earths population and use about 75 of the
    earths resources

Sustainable World
  • Goal of environmental problem solvers is to
    achieve a sustainable earth.
  • Sustainable world a world in which humans can
    continue to exist indefinitely with a high level
    of health and standard of living
  • - habitats will be preserved and garbage will be
    turned into harmless substances
  • - non renewable resources will be used sparingly
    and renewable resources will be used at a pace at
    which they can be replaced
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