case studies

Question 1

CASE STUDY
…………………….
Bio-Gas plants in india.

Answer 1

• Bottom up development scheme
• Farmers sell excess electricity back to the government or neighbours.
• Sustainable energy resource
• small scale impact
• generates 57% of indias enegydung biogas plants had been built in india
• by 2010 4 million
• this created 200,000 permanent jobs in poor rural areas
• less time collecting wood so children can get an education
• sludge can be used as fertiliser
• farmers use the electricity to pump water to irrigate their crops
• this has resulted in yeilds increasing

Question 2

CASE STUDY
……………………..
what is the hydrogen economy

Answer 2

• hydrogen most abundant element
• using hydrogen as a fuel produces no harmful emissions
• more efficient gram for gram than petrol
• hydrogen not found as pure element
• extraction processes from water,natural gas and biomass produce co2
• however could be zero emissions if solar energy or wind was use to extract it.
• cheap to produce
• many uses cars, heating
• safe
• no harmful emissions
• refuelling is very quick

Question 3

CASE STUDY
……………………..
Tar sand oil -CANADA

Answer 3

Negatives;

• causes pressure on migrant workers and local services
• causes culture clash
• lots of water needed
• pollutes water and disrupts salmon migratory routes
• large swathes of woodland need to be cleared
• non-renewable
• burn coal in order to extract

Positives;

• provides employment for minority intuit groups
• large reserves
• reduced dependence on middle eastern supply
• therefore more energy secure

Question 4

CASE STUDY
…………………….
Solar energy

Answer 4

NEGATIVES
-carbon emissions produced in manufacture
-toxic chemicals produced in manufacture
-land used for solar farms cant be used for agriculture
- unreliable
intermittent -stops and starts

POSITIVES

• photo-voltaic cells can be retrofitted to buildings
• renewable energy
• provides jobs as regular maintenance is needed

Question 5

what are the costs and benefits of groynes

Answer 5

Groynes £3000/m Deforestation needed in order to
build them
Interrupts flow of sediment through LSD
Bishopstone Protected (East of
Bishopstoen Glen)
Replaced every 15 years Allows beach material to be
trapped
Deprives other areas further down
coastline of sediment
Stops the base of sea wall being
undercut
Allows beach to accumulate