生物多样性英文PPT课件

1、1 ships of desert -exposition 2exposition exposition is explanatory writing. its purpose is to explain or clarify a point patterns of exposition: exemplification ;process analysis ;cause effect analysis; comparison and contrast; classification ;analogy; definition. 3organization part 1 (para. 1-8):

2、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 earths natura

3、l balance part 3 (para. 17-26): the solution to environmental destructions- reinventing and healing the relationship between civilization and the earth4loss of biodiversity 5biodiversity（生物多样性）definition：biological diversity (biodiversity) refers to a range of diverse living organisms (animals, plan

4、ts, micro-organisms) on a regular basis constituted by the combination of stable ecological complexes.6value of biodiversity and its significance ：direct value：（1） biodiversity provides food, fiber, building materials and furniture, and other industrial raw materials for human beings.7（2）biodiversit

5、y also have aesthetic value（美学价值）, we can cultivate our sentiments and beautify peoples lives. in addition, biodiversity can also stimulate inspiration for literary and artistic creation. winter sweet 8chrysanthemum 9bamboo10（3）biodiversity has an important ecological function. no matter what kind o

6、f 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. 11the potential value: as far as the medicinal properties, 80% of the populations in developing countries rely on p

7、lants or animals, to ensure the basic health.121314causes of biodiversity reduction:1、the rapid increase in population.15the population keeps increasing, so arable land must be expanded to meet demands of eating, this becomes the direct threat to the natural eco-systems.162、overexploitation 17environmental p