b3.4 environment revision
TRANSCRIPT
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B3:4 How humans affect the
environment
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4.1 Effects of population explosion Too many humans
Use things up
Pollute things
AgricultureQuarrying &
mining
Landfill
Building
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Water and land pollution
Water
Sewage
Fertilizer
Toxic chemicals
Land
Pesticides
Herbicides
Land fill
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Air pollution
Smoke and
gases
Sulphurdioxide
Acid rain
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Deforestation has
Caused:
Increased releaseof CO2
Reduced amountof CO2 locked upin wood
Happened sothat:
More crops forbiofuels can begrown
More cattle andrice can be raised,more methane
produced
Led to:
A reduction inbiodiversity
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Destruction of peat bogs
Peat
is ancient rotten timber
is used as a fuel
Releases more CO2 into the air
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Global warming
As levels of methane and CO2 increase,
the world is warming. This can lead to
Climate change
Sea level rises
Reduced biodiversity
Migration pattern changes
Changed species distribution
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Sequestration of CO2
This is when CO2 is removed from the
atmosphere
Dissolved in water in oceans and lakes
Locked up in plants by photosynthesis
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Biofuels
Ethanol- based fuels can be produced
by anaerobic fermentation of sugars
from plants (often maize) Purer ethanol can be distilled from the
fermentation product and used as fuel
for cars This ethanol is carbon neutral
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Biogas
Methane from
anaerobic
fermentation of
organic waste Small or large
scale
Needs to be warm enough for bacteriato work efficiently
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Making food production
efficient Short food chains make food production
more efficient (vegetarianism?)
Food production can be controlled toreduce energy wastage
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Sustainable food production
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Sustainable food production
Fish stocks can be maintained by
controlling fishing quotas and net size
The fugus Fusarium producesmycoprotein (Quorn) when grown in a
large scale fermenter
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