P3.5 Big energy issues

Question 1

adv. for solar

Answer 1

• can be used in remote places
• very cheap to run once installed
• no pollution/ greenhouse gases produced

Question 2

dis. for solar

Answer 2

• supply depends on weather
• expensive to buy and install
• cannot supply large scale demands

Question 3

dis. for hydroelectric energy

Answer 3

• expensive to build hydroelectric dams
• flood a large area behind the dam destroying habitats and resulting in greenhouse gas production from rotting vegetation

Question 4

dis. for tidal energy

Answer 4

• change marine habitats and can harm animals
• restrict access and can be dangerous for boats
• are expensive to build and maintain cannot control supply
• supply varies depending on time of the month

Question 5

adv. for tidal energy

Answer 5

• predictable supply as there are always tides
• can produces large amounts of electricity
• no fuel costs
• no pollution/ greenhouse gases produced

Question 6

dis. for wave energy

Answer 6

floating generators:
– change marine habitats and can
harm animals
– restrict access and can be
dangerous for boats
– are expensive to build, install,
and maintain
dependent on weather
cannot supply large scale demand

Question 7

adv. for wind energy, geothermal energy, wave energy, solar energy

Answer 7

• low running costs
• no fuel costs
• no pollution/ greenhouse gasses produced

Question 8

dis. for wind energy

Answer 8

• supply depends on weather
• large amounts of land needed to generate enough electricity for large scale demand
• noise pollution

Question 9

dis. for geothermal energy

Answer 9

• expensive to set up
• only possible in few suitable locations around the world

Question 9

adv. for biofuels

Answer 9

• can be carbon neutral
• reliable and supply can be controlled to meet demand

Question 10

dis. for biofuels

Answer 10

• expensive to produce
• growing biofuels requires a lot of land and water that could be used for food production
• can lead to deforestation- forests are cleared for growing biofuel crops

Question 11

source for geothermal energy

Answer 11

radioactive
substances deep
within the Earth
transfer heat energy
to the surface

Question 12

source for biofuel

Answer 12

fuel produced from
living or recently
living organisms,
for example, plants
and animal waste