生物多样性 英文PPT课件

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Value of biodiversity and its significance ：
Direct value：
（1） biodiversity provides food, fiber, building materials and furniture, and other industrial raw materials for human beings.
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Biodiversity（生物多样性）
Definition：Biological diversity (biodiversity) refers to
a range of diverse living organisms (animals, plants, micro-organisms) on a regular basis constituted by the combination of stable ecological complexes.
精选2overexploitation精选environmentalpollution精选killing精选精选problemsdifficultsolved
ships of desert
--exposition
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exposition
• Exposition is explanatory writing. Its purpose is to explain or clarify a point
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the potential value: as far as
the medicinal properties, 80% of the populations in developing countries rely on plants or animals, to ensure the basic health..源自22.23.
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winter sweet
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chrysanthemum
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bamboo
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（3）Biodiversity has an important ecological function. No matter what kind of ecosystem, wildlife is one of the essential components. Wildlife once reduced, the ecosystem stability would be destroyed, the survival environment of mankind would also be affected.
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（2）Biodiversity also have aesthetic value （美学价值）, we can cultivate our sentiments and beautify people’s lives. In addition, biodiversity can also stimulate inspiration for literary and artistic creation.
• Patterns of exposition: exemplification ;process analysis ;cause effect analysis; comparison and contrast; classification ;analogy; definition.
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Organization
• Part 3 (para. 17-26): the solution to
environmental destructions--- reinventing
and healing the relationship between
civilization and the earth
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Loss of biodiversity
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Causes of biodiversity reduction:
1、The rapid increase in population.
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The population keeps increasing, so arable land must be expanded to meet demands of eating, this becomes the direct threat to the natural eco-systems.
• Part 1 (para. 1-8): the list of the images of environmental destruction: the drying up of the Aral; deforestation; air pollution
• Part 2 (para. 9-16): analysis of the global threats posed by the environmental destruction and the common cause---the change in the relationship between human civilization and the earth’s natural balance
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2、Overexploitation
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Environmental pollution
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killing
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No!!!
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Are these problems difficult to be solved?
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As long as we can start out small.