[初二理化生]b2h sustainability物种灭绝的原因.ppt

B2h Sustainability 1.Describe reasons why animals become extinct / endangered: climate change, habitat destruction, hunting, pollution and competition Describe how endangered species can be helped: • protecting habitats • legal protection • education programmes • captive breeding programmes • creating artificial ecosystems (higher tier) Discuss reasons for conservation programmes: • protecting human food supply • ensuring minimal damage to food chains • future identification of plants for medical purposes • cultural aspects 2.State that whales have commercial value: tourism when alive; food, oil and cosmetics when dead Consider issues arising from keeping whales in captivity: entertainment, research, captive breeding programmes (higher tier) State that some aspects of whale biology are still not fully understood: communication, migration patterns and survival at extreme depths Discuss problems of whaling: getting international agreement, policing laws and culling for research 3. Explain the term sustainable development Explain how fish stocks and woodland can be sustained and yet exploited: • education • quotas on fishing • re-plantation of woodland (higher tier) Discuss the importance of population size, waste products and food and energy demands to sustainable development Recognise that sustainability requires planning and cooperation at local, national, and international levels Describe how sustainable development may protect endangered species Sustainability, or sustainable development, is the ability to provide for the needs of the present without affecting the ability of future generations to provide for themselves. What is sustainability? In the long-term, environmental degradation will result in an ecosystem that cannot support humans or other organisms. A major aim of sustainable development is preventing environmental degradation. This is a process where natural resources such as plants, animals, water and fuel are consumed more quickly then they are repla