b3.4
- Created by: janellebxx
- Created on: 17-04-17 18:38
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- B3.4 Humans and Their Environment
- Human Population
- Pollution
- waste can pollute the water through sewage, fertilisers and toxic chemicals
- the air through smoke and gases.e.g. co2
- the land through pesticides and herbicides
- Global warming
- Levels of gases methane and carbon dioxide are increasing
- it is increased by cattle and rice fields, burning of chopped down wood and industrial burning
- Can cause climate change , rise in sea level, reduced biodiversity, migration changes and distribution of species
- Deforestation
- this is the large scale cutting down of trees
- the land is used for crops for biofuels, cattle and rice fields to provide more food
- Increases carbon dioxide release, reduced rate of photosynthesis and amount of methane in atmosphere
- Causes reduction in biodiversity
- peat bogs release carbon dioxide into atmosphere when destroyed
- reduce this using peat free composts
- Biofuels
- biofuels produced from natural products due anaerobic respiration is fermentation
- Biogas is mainly methane and is produced from plant profucts and carbohydrate waste material
- large scale bio gas generators are near sewage works which reduced transport costs
- smaller biogas generators can suppy families and is collected and then digested by bacteria
- Biogas is dependant on temperature of generator, rate of fermentation, type of waste
- all generators need to be able to put in and remove waste and removing biogas and transporting it
- Food Production
- More efficient to produce food from plants
- more efficient by reducing number of stages in food chain and restricting energy lost
- sustainable food production allows food to be consumed now and conserve resources
- intensive farming can be cheap and secure and the conditions can be controlled as well as energy isnt wasted and cheap for farmer to sell
- it is also easy for disease to spread and animals can fight to get injured and welfare standards may not be met. Conditions are controlled by burning fossil fuels
- Food miles
- this is the distance from where food travels from its growth to where it is bought
- fossil fuels increase co2 in atmosphere
- consumers worry that burning fossil fuels produced fuel for transporting food
- reduce food miles is done by buying in britain and locally
- Mycoprotein
- a protein rich food suitable for vegetarians made by Fusarium
- fungus grows in a fermenter and on glucose syrup or in aerobic conditions
- biomass is harvested and purified to produce this
- Mycoprotein
- reduce food miles is done by buying in britain and locally
- this is the distance from where food travels from its growth to where it is bought
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