IELTS LISTENING PART 4 | TEST 2

Question 31-40

IELTS LISTENING PART 4 | TEST 2
IELTS LISTENING PART 4 | TEST 2

Answers

Question 31-40

31. fuel

  • Here’s what the speaker says:
    • “…the influence of human activity on climate is what I’ll talk about today.  At first, the effect on the climate was relatively small;  trees were cut down to provide fuel for fires….”
  • Explanation:  We must listen first for human factors involved in climate change.  Near the beginning of the talk, the speaker refers to trees, and the fact that they were cut down for fuel, to use in fires in people’s homes.
  • The answer is fuel.

32. combustion engine

  • Here’s what the speaker says:
    • “So, in what ways has human activity really impacted on the climate?  A major contributor was the advent of the Industrial Revolution at the end of the 18th century, combined with the invention of the combustion engine”.
  • Explanation:  We are still listening for human factors which have impacted on climate change.  The speaker mentions the Industrial Revolution as one factor and then refers to a second important factor which has contributed to climate change – the combustion engine.
  • The answer is combustion engine.

33. 145% / 145 per cent

  • Key words: Industrial Revolution, CO2, methane
  • Here’s what the speaker says:
    • “Carbon dioxide concentrations have climbed by 30% and methane levels have increased by 145%since the beginning of the Industrial Revolution”.
    • CO= carbon dioxide.  
  • Explanation:  We must now listen for the effects of climate change which are already known.  These effects have already taken place.  The speaker talks about the rise in global temperatures and then talks about the increase (↑) in the levels of carbon dioxide and methane in the atmosphere since the time of the Industrial Revolution.  The percentage increase of methane is said to be 145%.
  • The answer is 145%/ 145 per cent.

34. agriculture

  • Key words:  N2O, fertiliser, waste, car exhausts
  • Here’s what the speaker says:
    • “Nitrous oxide, or N2O, comes from natural sources – wet tropical forests, for instance – but it is also produced by human-related activities such as agriculture, which uses synthetic nitrogen fertilisers, rubbish disposal systems and vehicle emissions”.
    • waste management = rubbish disposal systems
    • car exhausts = vehicle emissions
  • Explanation:  Still referring to the known effects of climate change, the speaker now talks about another gas – nitrous oxide (N2O).  We are told that it comes from natural sources and human activities.  First on the list of human-related activities is agriculture, then waste management and car exhaust emissions.
  • The answer is agriculture.

35. (a) barrier

  • Key words:  greenhouse, gases, heat trapped
  • Here’s what the speaker says:
    • “Well, this is what we call the Greenhouse Effect.  Under normal conditions, the sun’s rays hit the earth and some are reflected back into space.  However, these gases (COand methane) create a barrier in the atmosphere which prevents a proportion of the sun’s rays from being reflected back into space – and, instead, the gases become trapped in the atmosphere”.
    • form = create   
  • Explanation:  The speaker explains whatis meant by the ‘Greenhouse Effect’.  The gases form a barrier through which the sun’s rays cannot pass.  They are trapped and the Earth warms up.
  • The answer is (a)barrier.

36. 46 million

  • Key words: 1998, number, at risk
  • Here’s what the speaker says:
    • “In 1998, it was reported that 46 million people lived in areas at risk of flooding…and the number of people at risk will increase significantly if sea levels rise”.
  • Explanation:  Listen for the date, and the number of people at risk is stated clearly.
  • The answer is 46 million.

37. 118 million

  • Key words: 1 metre.
  • Here’s what the speaker says:
    • “Further projections would see a rise of one metre put 118 million people in danger of losing their homes and livelihoods”.
    • at risk = in danger
  • Explanation:  The speaker gives first the number of people at risk if sea levels rise by only 50cm.    Then, we are given the figure if sea levels rise by one metre.
  • So, the answer is 118 million.

38. vegetation zones

  • Key words: change, arid, population, cities.
  • Here’s what the speaker says:
    • “Secondly, there would be a modification of vegetation zoneswith changes in theboundaries between grassland, shrub land, forest and desert.  This is already causing famine in arid areas of north-eastern Africa, and has instigated – and will continue to instigate – mass movements of people away from dry regions”.
    • change = modification
    • arid areas = dry regions
  • Explanation:  After talking about sea levels, the speaker moves on to the second of the future effects of climate change.  The change/modification would take place in the changes of boundaries of different vegetation zones.  The results would be more dry areas and movement of people to cities to escape famine.
  • The answer is vegetation zones.

39. (certain) disease(s)

  • Key words: increase, pests, malaria.
  • Here’s what the speaker says:
    • “Another potentially disastrous effect of climate change is an increase in the range and distribution of pests which could bring about an increase in the prevalence of  certain diseases.  If we think of the malaria-carrying mosquito, for example….”
  • Explanation:  When the speaker says ‘potentially’, this clearly refers to future (not present) effects.  After the increase in pests, for example mosquitos, there could be an increas in diseases.
  • The answer is (certain) disease(s).

40. species composition

  • Key words: ecosystems, shift, die, multiply
  • Here’s what the speaker says:
    • “The last effect I’m going to mention today is the change in ecosystems.  Global warming will influence species composition – for both flora and fauna – such that some animal species will disappear and others will multiply….
    • shift = change
    • die = disappear
  • Explanation: The speaker talks about the final point of future effects – the change in ecosystems. Some species will die and others – in contrast – will multiply.  This is referred to as a change in species composition and it will affect animals and plants.
  • The answer is species composition.

Transcript

You will hear a lecture on climate change. First you have some time to look at questions 31 to 40. [20 seconds]

Listen carefully and answer questions 31 to 40.

This lecture in Environmental Studies is on the topic of human influence on climate change. First, I’ll outline some of the factors affecting climate, then go on to discuss what has already occurred, and finish up by speculating on the effects.

Previously, we’ve covered how factors such as ocean currents and prevailing winds affect climate change naturally. However, the influence of human activity on climate is what I’ll talk about today. At first, the effect on the climate was relatively small; trees were cut down to provide fuel for fires, and, as we know, trees absorb carbon dioxide and produce oxygen so the amount of carbon dioxide in the atmosphere would have increased – but not noticeably.

So, in what ways has human activity really impacted on the climate? A major contributor was the advent of the Industrial Revolution at the end of the 18th century, combined with the invention of the combustion engine. In addition, Earth’s burgeoning population has had a marked effect on climate. The first two factors saw increased amounts of carbon dioxide being released into the atmosphere from the burning of fossil fuels, such as coal and oil. The final one, human expansion, has resulted in deforestation on such a scale that the extra carbon dioxide in the air cannot be soaked up and converted into oxygen by the remaining trees.

Okay – so what has already happened? Well, global temperatures have risen by 0.6 degrees Celsius in the last 130 years. Levels of carbon dioxide, methane and nitrous oxide gases have escalated. Carbon dioxide concentrations have climbed by 30% and methane levels have increased by 145% since the beginning of the Industrial Revolution. Gas produced by fossil fuel extraction, livestock and paddy fields is primarily responsible for the growth of methane levels. Nitrous oxide, or N2O, comes from natural sources – wet tropical forests, for instance – but it is also produced by human-related activities such as agriculture, which uses synthetic nitrogen fertilisers, rubbish disposal systems and vehicle emissions.

How do gases like carbon dioxide and methane affect the climate? Well, this is what we call the Greenhouse Effect. Under normal conditions, the sun’s rays hit the earth and some are reflected back into space. However, these gases (CO2 and methane) create a barrier in the atmosphere which prevents a proportion of the sun’s rays from being reflected back into space – and, instead, the gases become trapped in the atmosphere. It’s simple really – because the sun’s rays can’t escape, the Earth heats up.

What are the possible effects? Firstly, a rise in sea levels: we already know that the Arctic ice cap has melted and shrunk considerably and great chunks of ice have been lost from Antarctica. In 1998, it was reported that 46 million people lived in areas at risk of flooding … and the number of people at risk will increase significantly if sea levels rise. It is estimated that a rise of only 50 centimetres would put that number at 92 million. Further projections would see a rise of one metre put 118 million people in danger of losing their homes and livelihoods – not to mention the loss of prime, fertile farmland. Experts predict a rise of at least 50 centimetres over the next 50 years or so.

Secondly, there would be a modification of vegetation zones with changes in the boundaries between grassland, shrub land, forest and desert. This is already causing famine in arid areas of north-eastern Africa, and has instigated – and will continue to instigate – mass movements of people away from dry regions. What we are seeing now is only the first stage, with temporary camps for climate refugees already at overcapacity; in the future, there will be significant migration resulting in extreme overcrowding of towns and cities.

Another potentially disastrous effect of climate change is an increase in the range and distribution of pests which could bring about an increase in the prevalence of certain diseases. If we think of the malaria-carrying mosquito, for example, which thrives in warmer regions – at the moment, about 45% of the world’s population is exposed to malaria – but with an increase in temperature, there will be many millions more cases of malaria a year.

The last effect I’m going to mention today is the change in ecosystems. Global warming will influence species composition – for both fauna and flora – such that some animal species will disappear and others will multiply; and it’ll be the same for plants and trees. It is predicted that around two-thirds of the world’s forests will undergo major changes of some kind. Scientists also expect deserts will become hotter and, of course, desertification will continue at an increasingly worrying rate and will become harder, if not impossible, to reverse.

What can we do to stop the process? Well, that’s the subject of next week’s lecture – so I hope to see you all there.

Narrator: That is the end of section 4. You now have half a minute to check your answers. [30 seconds]

That is the end of the listening test. You now have 10 minutes to transfer your answers to the listening answer sheet.

IELTS Listening Part 4 British Council

IELTS LISTENING PART 4

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