human impact
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Transcript of human impact
![Page 1: human impact](https://reader034.fdocuments.in/reader034/viewer/2022052523/55508f14b4c905a85c8b4fca/html5/thumbnails/1.jpg)
Human Impact on the Biosphere
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Natural Resources
• Renewable resources
• Nonrenewable resources
Human activities affect the
quality and quantity of our
renewable and nonrenewable resources.
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Sustainable Use of Resources
Sustainability
- intelligent and responsible management and conservation of our resources
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Wastes
• Biodegradable wastes
– materials that can be broken down by microorganisms
– e.g. organic wastes (sewage and scraps of food)
• Non-biodegradable wastes
– can not be broken down by natural processes or are
broken down very slowly
– e.g. asbestos, glass, certain plastics and metals,
radioactive wastes and chemicals
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• pollutants accumulate in the tissues of organisms
• further concentrated up the food chain (because the
biomass at a given trophic level is produced from a
much larger biomass ingested from the level below)
• e.g. pesticides and industrial waste products
DDT was once used to prevent malaria, yellow fever, lice and the spread of insect pests DDT poisoning in fish and birds
Biological Magnification
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Land Resources
• Land pollution
• Soil erosion
• Desertification
• Deforestation
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Water Resources
• Chemical Contamination
• Sewage Contamination
• Thermal Pollution
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Air Resources
• Smog
• Acid Rain
• Greenhouse Effect
• Ozone Depletion
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Biodiversity
• Ecosystem diversity
• Species diversity
• Genetic diversity
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Threats to Biodiversity
• Demand for wildlife products
• Habitat destruction
• Pollution
• Introduction of exotic species
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Conservation Efforts
• Reforestation
• Endangered Species and Protected Areas
• Recycling
• Cleaning up the environment and keeping it clean.