B3.4 Humans And Their Enviroment Flashcards
What are the issues with population increase?
More land use
More demand for resources
More pollution
More waste
Why is the population increasing?
Infrastructure is improving
More children
Live longer
Better health care
Why is there increase land use?
More people Food Mining Quarrying Landfills
Why is there more resource demand?
Higher standard of living eg. Cars, technology, more hygiene
Fossil fuels being used
What does more waste do?
More landfills
More sewage
Toxic chemicals
Damages food chains
What’s bioaccumulation?
Small amounts if chemicals in water, along the food chain more is present so could be harmful
What can air pollution cause?
Acid rain
( they now collect it and make plaster board which is calcium sulphate)
Global dimming- particulates from burning
Why does deforestation and peat destruction increase carbon dioxide levels?
Burning releases CO2
Less plants and they photosynthesise
Dead vegetation decays
What can produce methane?
Cattle
Micro organisms in rice fields
What happens when peat bogs are destroyed?
They are huge carbon sinks
Burned
CO2 released
Sold as fertiliser
What are the effects of global warming?
Climate change Rising sea levels Reduced diversity Changes in migration Changes in distribution
When is ethanol made?
Fermentation
When micro organisms respire in anaerobic conditions
Pro’s of biofuels?
Renewable Carbon neutral Sustainable Lower fuel price Good in rural areas
Con’s of biofuels?
Uses land Low yield Flammable Hard to store No infrastructure
Where’s biogas from?
When micro organisms decompose dead plants or animal waste
What’s biogas ?
Flammable gases
Mainly methane
Uses of biogas?
Cooking, heating, electricity
How is biogas made?
In anaerobic digestion
At 30 degrees
Manure in make bubbles and the gas collected is biogas
Why is biogas boos for poor countries?
From cow poo Cheap Simple Sustainable Slurry can be used on crop as fertiliser
Why does biomass decrease along the food chain?
Lost in: Respiration Movement Growth Excretion Making new tissue
Is it more efficient to make food from plants or animals?
Plants
How can you reduce energy loss of food?
Stop animals moving
Keep warm surroundings
Problems with animals in cramps conditions?
Heating costs
More distress so more drugs which may affect the food
Cost more for medicine care
Problems with free range animals?
Expensive
More muscles
Use more energy
Why has fishing increased?
Population increase
Better technology
Staple part of the diet
How are fish protected?
Larger holes in fishing nets
Banning fishing in breeding season
Protective breaking grounds
Prosecution of people who overfish
Total amount of fish allowed to be caught a year
Monitor fish boats so they don’t cross into another countries waters
What’s mycoprotein?
Protein from fungus (fusarium)
Where is fusarium from?
Grown in glucose syrup
Then it’s harvested and purified
What are the good things are mycoproteins?
Can be different textures and flavours
Low in fat
Cheap to make
Vegetarian
How are mycoproteins made?
In a machine
Motor mixes it
Fungus respire aerobically
Tap at the bottom to collect the protein
