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Flashcards in write up Deck (27)
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1

what were management strategies to reduce the risk of Boscastle flood happening again?

- £4.5 million has been spent on flood defence scheme
- river channel has been made deeper and wider to hold more water
- Boscastle car park has been raised + given a permeable surface

2

what is the quaternary period?

- most recent geological time period
- period of time from 2.6 million years ago to present day

3

what was the period before the quaternary like?

earths climate warmer + quite stable

4

how did things change in quaternary?

- during quaternary global temp had shifted between:
- cold glacial periods that last around 100,000 years
- and warmer interglacial periods that last around 10,000 years

5

when did the last glacial period end?

around 15,000 years ago - since then climate has been warming

6

how are ice cores evidence for climate change?

- scientists often use ice cores to detect changes in temp
- by analysing gases trapped in layers of ice can tell what temp was each year

7

how are early springs evidence for climate change?

- in recent years have been signs of seasonal shift - spring arrives earlier + winters tend to be less severe
- these seasonal changes affect the resting + migration patterns in wildlife

8

how is pollen analysis evidence for climate change?

- pollen from plants get preserved in sediment
- scientists can identify + date preserved pollen to show which species were living at the time

9

how are tree rings evidence for climate change?

- scientists take the cores of trees + count rings to find the age of tree
- thickness of each ring shows what the climate was like
- reliable source of evidence of climate change for the past 10,000 years

10

what do orbital changes affect?

- affect how much solar radiation the earth receives
- more energy means more warming

11

what are the variations of how the earth orbits?

- stretch - the earth's orbit around the sun varies from circular to elliptical - called eccentricity

- tilt - earths axis is tilted at an angle as it orbits the sun
- wobble - earths axis wobbles

12

how is volcanic activity a possible factor for climate change?

- during a volcanic eruption carbon dioxide is released into the atmosphere
- volcanic activity may also cause short term changes to the climate

13

how is solar output a possible cause of climate change?

- there can be fluctuations in the amount of radiation from the sun
- reduced solar output means that the earth's climate may become cooler in some areas
- solar output isn't thought to have a global effect on climate change

14

how can cement production be a possible cause?

- cement is made from limestone - which contains carbon
- when cement is produced - lots of co2 released into atmosphere

15

what else can be a possible cause of climate change?

- greenhouse effect
- burning of fossil fuels
- farming
- deforestation

16

what effects does climate change have on the environment?

- sea levels are rising due to land ice melting
- sea ice shrinking leading to loss of polar habitats
- precipitation patterns changing

17

how can biodiversity decrease as a result of climate change?

- some species now live at higher latitudes due to warming temperatures
- some habitats destroyed or damaged - species can become extinct

18

how can climate change affect people?

- in some places deaths due to heat have increased
- some areas could become so hot + dry - difficult/ impossible to inhibit
- in some areas - problems with water availability caused by changing rainfall patterns

19

how is climate change affecting farmers?

- globally some crops have suffered from climate change resulting in smaller yields
- this could increase malnutrition, illness and death from starvation

20

what does climate change mean for the weather?

- means weather getting more extreme
- means more money has to be spent on predicting extreme weather - reducing their impacts + rebuilding after they take place

21

how is planting trees a good mitigation strategy to reduce causes of climate change?

more co2 absorbed from atmosphere through photsynthesis

22

how is carbon capture a good mitigation strategy to reduce causes of climate change?

- carbon capture and storage is designed to reduce emissions from power stations burning fossil fuels
- involves capturing co2 + transporting it to safe places where it can be stored

23

how is alternative energy production a good mitigation strategy to reduce causes of climate change?

replacing fossil fuels with nuclear or renewable energy can help reduce greenhouse gas emissions

24

how are international agreements a good mitigation strategy to reduce causes of climate change?

- in 2005, the Kyoto protocol became international law
- the countries that signed up to the treaty pledged to reduce their carbon emissions by 5%

- but overall impacts had been small
- the US refused to join + major developing countries like China + India were not required to make any reductions

25

how is changing agricultural systems a good adaptation strategy?

- may be necessary to plant new crop types that are more suited to the new climate
- some regions - biotechnology is being used to create new crop varieties resistant to extreme weather events

26

how is managing water supply a good adaptation strategy?

- water meters can be installed in homes to discourage excessive water use
- rainwater + wastewater can be collected and recycled

27

how is coping with rising sea levels a good adaptation strategy?

- better flood warning systems are being put in place + physical defences such as flood barriers are being built
- in areas that can't afford expensive flood defences people are building raised flood shelters