Flashcards
Human Impact
Flashcards do conjunto (13)
- 1What is a planetary boundary?Limits between which global systems must operate to prevent abrupt and irreversible environmental change.
- 2What is a core boundary?A planetary boundary which, if crossed, would drive the earth into a new and unpredictable state with severe consequences for the biosphere.
- 3What are the main points surrounding the climate change boundary?- It is a core boundary and it has been crossed.
- The effects of us crossing it will be seen for centuries, even if we stopped greenhouse emissions completely.
- The biofuel industry has been developed to contribute to a reduction in fossil fuel consumption. - 4What is biofuel?A fuel made by a biological process, such as anaerobic digestion, rather than by geological processes, such as long term heat and compression.
- 5Discuss the advantages and disadvantages of biofuel:- They are made using biological processes.
- They reduce the use of fossil fuels.
- Growing plant material interferes with the use of land for food production.
- European bioethanol reduces greenhouse gas production by 60-90% compared to fossil fuel.
- Sustainable biofuel production relies of sustainable planting and efficient technical systems.
- Deforestation to grow the crops leads to soil erosion and biodiversity loss. - 6What are the main points surrounding the biosphere integrity boundary?- It is the second core boundary and has been crossed.
- Without significant changes, more than half of the world's marine species may be extinct by 2100.
- Herbaceous plants are now growing in tundra where only mosses and lichen were seen before.
- Coral reef bleaching is occurring. - 7What are the main points surrounding the land system change boundary?- It is suggested that this boundary has been crossed.
- Deforestation and urban development are the significant factors in this. - 8What are the main points surrounding the biogeochemical flows boundary?- Biogeochemical flows refers to the cycling of minerals through biotic and abiotic components of the environment.
- Agricultural fertilisers have been used so intensively that both the nitrogen and phosphorus cycles have been crossed.
- This leads to further issues such as eutrophication. - 9What are the main points surrounding the stratospheric ozone boundary?As in chemistry
- 10What are the main points surrounding the the ocean acidification boundary?- Carbon dioxide from the air dissolves in bodies of water as hydrogen carbonate, releasing a hydrogen ion and decreasing the pH of the ocean.
- 11What are the main points surrounding the freshwater use boundary?- Freshwater availability has decreases and not equally distributed.
- Agriculture consume more fresh water than any other human activity.
- There is an increased demand as people move to warm climates, which have a low level of fresh water.
- Water pollution makes water unsuitable for use. - 12What are the main points surrounding the atmospheric aerosol loading boundary?- Atmospheric aerosols are the microscopic particles put into the atmosphere by the combustion of fuels of by creating dust from digging and quarrying.
- Doubled since the industrial revolution. - 13—
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- A level Biology (Component 1) FlashCards sobre Human Impact, criado por Beth Williams em 10-04-2018.
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- Beth Williams
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