Cambridge IELTS 4 Listening Test 1
4 parts · 40 questions · 30 minutes
Enquiring about a college social programme
Questions 1–4
Complete the notes below. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.
NOTES ON SOCIAL PROGRAMME
Example — Number of trips per month: 5
Visit places which have:
• historical interest
• good (1) …………………………
• (2) …………………………
Cost: between £5.00 and £15.00 per person
Note: special trips organised for groups of (3) ………………………… people
Time: departure – 8.30 a.m.
return – 6.00 p.m.
To reserve a seat: sign name on the (4) ………………………… 3 days in advance
Questions 5–8
Complete the table below. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.
WEEKEND TRIPS
| Place | Date | Number of seats | Optional extra |
|---|---|---|---|
| St Ives | (5) ………………………… | 16 | Hepworth Museum |
| London | 16th February | 45 | (6) ………………………… |
| _____ | 3rd March | 18 | S.S. Great Britain |
| Salisbury | 18th March | 50 | Stonehenge |
| Bath | 23rd March | 16 | (8) ………………………… |
Questions 9–10
Complete the table below. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.
9. For further information: Read the …………………………
10. or see Social Assistant: Jane …………………………
Riverside Industrial Village
Questions 11–13
Complete the sentences below. Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.
11. Riverside Village was a good place to start an industry because it had water, raw materials and fuels such as ………………………… and ………………………… .
12. The metal industry was established at Riverside Village by ………………………… who lived in the area.
13. There were over ………………………… water-powered mills in the area in the eighteenth century.
Questions 14–20
Label the plan below. Write NO MORE THAN TWO WORDS for each answer.

Label the plan of Riverside Industrial Village.
• 14 (the road along the bottom of the plan): (14) ………………………… Road
• 15 (immediately to the right of the entrance): The (15) …………………………
• 16 (to the left of the entrance): The (16) …………………………
• 17 (the large building at the top of the plan): The (17) …………………………
• 18 (top right-hand corner): The (18) …………………………
• 19 (on the far side of the Grinding Shop from the Engine Room): The (19) …………………………
• 20 (the row of buildings beside the river): The (20) ………………………… for the workers
A tutorial about an assignment extension
Questions 21–22
Questions 21 and 22: Choose the correct letter, A, B or C.
21. Melanie says she has not started the assignment because
A she was doing work for another course.
B it was a really big assignment.
C she hasn't spent time in the library.
22. The lecturer says that reasonable excuses for extensions are
A planning problems.
B problems with assignment deadlines.
C personal illness or accident.
Questions 23–27
What recommendations does Dr Johnson make about the journal articles? Choose your answers from the box and write the letters A–G next to questions 23–27.
Recommendations
A must read
B useful
C limited value
D read first section
E read research methods
F read conclusion
G don't read
23. Jackson:
24. Roberts:
25. Morris:
26. Cooper:
27. Forster:
Questions 28–30
Label the chart below. Choose your answers from the box below and write the letters A–H next to questions 28–30.
Possible reasons
A uncooperative landlord
B environment
C space
D noisy neighbours
E near city
F work location
G transport
H rent

28. Bar 2:
29. Bar 4:
30. Bar 6:
The urban landscape
Questions 31–40
Complete the notes below. Write NO MORE THAN TWO WORDS for each answer.
THE URBAN LANDSCAPE
Two areas of focus:
• the effect of vegetation on the urban climate
• ways of planning our (31) ………………………… better
Large-scale impact of trees:
• they can make cities more or less (32) …………………………
• in summer they can make cities cooler
• they can make inland cities more (33) …………………………
Local impact of trees:
• they can make local areas
– more (34) …………………………
– cooler
– more humid
– less windy
– less (35) …………………………
Comparing trees and buildings
Temperature regulation:
• trees evaporate water through their (36) …………………………
• building surfaces may reach high temperatures
Wind force:
• tall buildings cause more wind at (37) ………………………… level
• trees (38) ………………………… the wind force
Noise:
• trees have a small effect on traffic noise
• (39) ………………………… frequency noise passes through trees
Important points to consider:
• trees require a lot of sunlight, water and (40) ………………………… to grow
Answers
1. shopping
2. guided tours
3. more than 12
4. notice board
5. 13th February
6. Tower of London
7. Bristol
8. American Museum
9. student newspaper
10. Yentob
11. coal and firewood
12. local craftsmen
13. 160
14. Woodside
15. Ticket Office
16. Gift Shop
17. Workshop
18. Showroom
19. Café
20. cottages
21. she was doing work for another course.
22. personal illness or accident.
23. E
24. B
25. G
26. F
27. C
28. D
29. A
30. B
31. cities
32. windy
33. humid
34. shady
35. dangerous
36. leaves
37. ground
38. filter
39. low
40. space
Explanations
- 1. shopping
- 'Well, obviously it varies, but always places of historical interest and also which offer a variety of shopping, because our students always ask about that.' 'Historical interest' is already printed, so the second thing the places offer is (a variety of) shopping.Common trap: 'historical interest' is spoken first and is already on the page — the answer is the item that follows 'and also'.
- 2. guided tours
- '...and then we go for ones where we know there are guided tours, because this gives a good focus for the visit.' The third criterion for choosing a place is that guided tours are available.Common trap: The reason clause ('a good focus for the visit') is tempting, but the feature the places have is the guided tours themselves.
- 3. more than 12
- 'Oh, and we do offer to arrange special trips if, you know, there are more than twelve people.' 'Twelve' is spoken as a word; the note needs the size of the group, i.e. more than 12.Common trap: 'five every month' and 'less than three hours drive' are the other numbers in this stretch — neither is a group size.
- 4. notice board
- 'You sign your name on the notice board.' ... 'And we do ask that you sign up three days in advance.' The place you sign is the notice board.Common trap: 'three days in advance' is already printed on the line, so the gap is the place, not the timing.
- 5. 13th February
- 'Well, the first one is St Ives. That's on the thirteenth of February and we'll have only sixteen places available.' St Ives is the 13th of February.Common trap: The London trip on the sixteenth of February follows immediately, and '16' is also the number of seats printed on the St Ives row.
- 6. Tower of London
- 'Then there's a London trip on the sixteenth of February and we'll be taking a medium-sized coach so there'll be forty-five places on that, and, let's see, the optional extra is the Tower of London.'Common trap: The man's reply 'Oh, I've already been there' can distract from the name itself.
- 7. Bristol
- 'After that there's Bristol on the third of March.' ... 'Bristol – B-R-I-S-T-O-L.' The place for the 3rd March trip is spelled out.Common trap: The optional extra for this row, the S.S. Great Britain, is already printed — the gap is the town.
- 8. American Museum
- 'And where's the optional visit?' – 'It's to the American Museum – well worth a visit.' The optional extra on the Bath trip is the American Museum.Common trap: Bath is discussed as 'the Roman city', which tempts a Roman-sounding answer instead of the museum actually named.
- 9. student newspaper
- 'By the way, if you want more information about any of the trips, have a look in the student newspaper.' More information = the student newspaper.Common trap: The schedule 'hasn't been printed out yet', so the printed schedule is not where you look.
- 10. Yentob
- 'Or, have a word with my assistant; her name is Jane Yentob – that's Y-E-N-T-O-B.' The surname is spelled out.Common trap: Only the surname is missing — 'Jane' is already printed.
- 11. coal and firewood
- 'The water and the availability of raw materials in the area, like minerals and iron ore, and also the abundance of local fuels, like coal and firewood, all made this site suitable for industry.' Water and raw materials are already printed; the fuels are coal and firewood.Common trap: 'minerals and iron ore' are given in the same sentence, but they are the raw materials, already printed in the stem.
- 12. local craftsmen
- 'At that time, local craftsmen first built an iron forge just behind the village here, on the bend in the river.' The people who set up the metal industry were local craftsmen.Common trap: 'who lived in the area' is already printed, so a general answer like 'local people' adds nothing — the key word is craftsmen.
- 13. 160
- 'By the seventeenth and eighteenth centuries the region's rivers supported more than a hundred and sixty water mills.' 'More than a hundred and sixty' = over 160.Common trap: 'twelfth century' and 'nineteenth century' are both mentioned nearby, but the figure asked for belongs to the eighteenth.
- 14. Woodside
- 'And of course, running along the bottom is Woodside Road, got it?' The road at the foot of the plan is Woodside Road.Common trap: 'Road' is already printed after the gap, so only the name is needed.
- 15. Ticket Office
- 'Now we're standing at the entrance, see it at the bottom, and immediately to our right is the Ticket Office.'Common trap: The toilets are named in the very next clause and are already labelled on the plan, further to the right.
- 16. Gift Shop
- 'In front of us is the car park, as you can see, and to the left, by the entry gate is the Gift Shop.'Common trap: The car park is mentioned first in the same sentence, but it is already labelled on the plan.
- 17. Workshop
- 'The big, stone building at the top is the main Workshop. That's where the furnace is and where all the metal was smelted and the tools were cast.'Common trap: 'furnace' is described in the same breath and sounds like a building name, but it is inside the Workshop.
- 18. Showroom
- 'Now, in the top right-hand corner, that building with bigger windows is the Showroom, where samples of all the tools that were made through the ages are on display.'Common trap: 'samples ... on display' suggests a display room or museum, but the speaker names the building the Showroom.
- 19. Café
- 'In the top left corner is the Grinding Shop... And on one side of that you can see the Engine Room and on the other is the Café.' The Engine Room and the Grinding Shop are already labelled, so 19 is the Café.Common trap: Both the Grinding Shop and the Engine Room are named in the same sentence and both are already printed on the plan.
- 20. cottages
- 'The row of buildings you can see on the left are the cottages. These were built for the workers towards the end of the eighteenth century.'Common trap: The stables and Works Office are described immediately afterwards, but they sit across the yard and are already labelled.
- 21. she was doing work for another course.
- 'Well, I had a really big assignment due in for another course, and I've been spending all my time on that.' The reason she has not started is the other course's assignment.Common trap: 'a really big assignment' is lifted straight into option B but refers to the other course's work.
- 22. personal illness or accident.
- '...extensions are normally given only for medical or compassionate reasons, otherwise it's really a question of organising your study.' Medical or compassionate = personal illness or accident.Common trap: 'organising your study' and 'didn't plan their work properly' sit in the same sentence and tempt option A, but they are given as invalid excuses.
- 23. E
- 'You should also read the article by Jackson, but just look at the part on the research methodology – how they did it.' = E, read research methods. (Example: Anderson and Hawker = A.)Common trap: 'You should also read' echoes the Example's 'must read', but the instruction narrows it to the methodology section.
- 24. B
- 'And if you have time, the one by Roberts says very relevant things, although it's not essential.' Relevant but not essential = B, useful.Common trap: 'very relevant' sounds like 'must read', but 'not essential' downgrades it to merely useful.
- 25. G
- 'Now, the one by Morris. I wouldn't bother with that at this stage, if I were you.' Don't bother = G, don't read.Common trap: 'at this stage' hints the article may have value later, but the recommendation now is not to read it.
- 26. F
- 'Well, yes, in a way, but just look at the last part, where he discusses the research results.' The last part discussing results = F, read conclusion.Common trap: Melanie reports that 'the article by Cooper is important', which tempts A; and 'research results' resembles E, read research methods.
- 27. C
- 'And lastly, there's Forster – I can't think why I included that one. It's not bad and could be of some help, but not that much.' Some help but not much = C, limited value.Common trap: 'I can't think why I included that one' pushes towards G, but he still allows that it 'could be of some help', which is limited value rather than no value.
- 28. D
- 'Bar two is to do with the people living nearby disturbing them, so they chose to move away to somewhere quieter.' People living nearby disturbing them = D, noisy neighbours.Common trap: 'somewhere quieter' describes the destination, not the reason label — the labelled reason is the neighbours themselves.
- 29. A
- 'Bar number four refers to problems when the owner of the property won't help fix things that go wrong. In other words, the owner is not helpful and so the tenants move out.' = A, uncooperative landlord.Common trap: 'the owner of the property' never uses the word landlord, so the paraphrase has to be made.
- 30. B
- 'Bar number six is interesting. That reason was given quite a lot – people moving because they wanted to be in a more attractive neighbourhood.' A more attractive neighbourhood = B, environment.Common trap: 'neighbourhood' echoes D, noisy neighbours; here it is the quality of the surroundings, i.e. the environment.
- 31. cities
- 'There are two major areas that I will focus on in my talk: how vegetation can have a significant effect on urban climate, and how we can better plan our cities using trees to provide a more comfortable environment for us to live in.'Common trap: The first focus, the effect of vegetation on urban climate, is already printed above the gap.
- 32. windy
- 'They can make a city, as a whole, a bit less windy or a bit more windy, if that's what you want.' 'More or less' is printed, so the missing word is windy.Common trap: 'cooler' and 'more humid' follow in the same list but belong to the two lines below.
- 33. humid
- '...or they can make it a bit more humid if it's a dry inland city.' Inland cities become more humid.Common trap: 'dry' is the adjective attached to the city, not the effect the trees have on it.
- 34. shady
- 'On the local scale – that is, in particular areas within the city – trees can make the local area more shady, cooler, more humid and much less windy.' The first item in the spoken list is shady.Common trap: The spoken list runs in the same order as the printed one, so the answer is the only item not already printed.
- 35. dangerous
- 'In fact trees and planting of various kinds can be used to make city streets actually less dangerous in particular areas.' Less dangerous is the last local effect.Common trap: It comes in a separate sentence after the four-item list, so it is easy to miss while still waiting for a fifth list item.
- 36. leaves
- 'It evaporates water through its leaves, and that means that the temperature of the leaves is never very far from our own body temperature.'Common trap: 'internal mechanism' is named just before and sounds like the answer, but the water leaves through the leaves.
- 37. ground
- 'The reason that high buildings make it windier at ground level is that, as the wind goes higher and higher, it goes faster and faster.'Common trap: 'those high level winds' appears a moment later in the same explanation, but the printed word 'level' follows the gap here, so the answer is ground.
- 38. filter
- 'Trees filter the wind and considerably reduce it, preventing those very large strong gusts that you so often find around tall buildings.'Common trap: 'prevent' applies to the gusts, not to the wind force in general.
- 39. low
- 'Low-frequency noise, in particular, just goes through the trees as though they aren't there.'Common trap: 'much of the vehicle noise still goes through the trees' comes first and describes traffic noise, already printed above.
- 40. space
- 'Trees need water to grow. They also need some sunlight to grow and you need room to put them.' Water and sunlight are printed, so the third requirement is room/space.Common trap: 'root systems' and 'branches blocking windows' are described just before as the reasons trees take up a lot of space.
Audio transcripts
Part 1 — Enquiring about a college social programme
MAN: Good morning. WOMAN: Good morning. How can I help you? MAN: I understand that the school organises ... umm, trips to different ... WOMAN: Yes, we run five every month: three during weekends and two Wednesday afternoon trips. MAN: What sort of places? WOMAN: Well, obviously it varies, but always places of historical interest and also which offer a variety of shopping, because our students always ask about that ... and then we go for ones where we know there are guided tours, because this gives a good focus for the visit. MAN: Do you travel far? WOMAN: Well, we're lucky here, obviously, because we're able to say that all our visits are less than three hours drive. MAN: How much do they cost? WOMAN: Again it varies - between five and fifteen pounds a head, depending on distance. MAN: Ah ha ... WOMAN: Oh, and we do offer to arrange special trips if, you know, there are more than twelve people. MAN: Oh right, I'll keep that in mind. And what are the times normally? WOMAN: We try to keep it pretty fixed so that students get to know the pattern. We leave at eight-thirty a.m. and return at six p.m. We figure it's best to keep the day fairly short. MAN: Oh yes. And how do we reserve a place? WOMAN: You sign your name on the notice board. Do you know where it is? MAN: Ah ha. I saw it this morning. WOMAN: And we do ask that you sign up three days in advance so we know we've got enough people interested to run it, and we can cancel if necessary, with full refund of course. MAN: That's fine, thanks. MAN: And what visits are planned for this term? WOMAN: Right, well I'm afraid the schedule hasn't been printed out yet, but we have confirmed the dates and planned the optional extra visits which you can also book in advance if you want to. MAN: Oh that's all right. If you can just give some idea of the weekend ones so I can, you know, work out when to see friends, etcetera. WOMAN: Oh sure. Well, the first one is St Ives. That's on the thirteenth of February and we'll have only sixteen places available 'cos we're going by minibus. And that's a day in town with the optional extra of visiting the Hepworth Museum. MAN: Oh right ... yeah ... that sounds good. WOMAN: Then there's a London trip on the sixteenth of February and we'll be taking a medium-sized coach so there'll be forty-five places on that, and, let's see, the optional extra is the Tower of London. MAN: Oh, I've already been there. WOMAN: After that there's Bristol on the third of March. MAN: Where? WOMAN: Bristol ... B-R-I-S-T-O-L. MAN: OK ... WOMAN: That's in a different minibus with eighteen places available, oh, and the optional extra is a visit to the S.S. Great Britain. MAN: OK ... WOMAN: We're going to Salisbury on the eighteenth of March and that's always a popular one because the optional extra is Stonehenge, so we're taking the large coach with fifty seats ... MAN: Oh good. WOMAN: And then the last one is to Bath on the twenty-third of March. MAN: Oh yes. Is Bath the Roman city? WOMAN: Yes, that's right, and that's in the sixteen-seater minibus. MAN: And where's the optional visit? WOMAN: It's to the American Museum - well worth a visit. MAN: OK, well that's great, thanks for all that ... WOMAN: My pleasure. By the way, if you want more information about any of the trips, have a look in the student newspaper. MAN: OK. WOMAN: Or, have a word with my assistant; her name is Jane Yentob - that's Y-E-N-T-O-B. MAN: Right, I've got that. Thank you very much for all your help. WOMAN: You're very welcome. I hope you enjoy the trips.
Part 2 — Riverside Industrial Village
Good afternoon everybody and welcome to Riverside Industrial Village. To start your visit I'm just going to give you a brief account of the history of the museum before letting you roam about on your own. I won't keep you long. OK? Now, from where we're standing you've got a good view of the river over there. And it was because of this fast-flowing water that this site was a natural place for manufacturing works. The water and the availability of raw materials in the area, like minerals and iron ore, and also the abundance of local fuels, like coal and firewood, all made this site suitable for industry from a very early time. Water was the main source of power for the early industries and some of the water wheels were first established in the twelfth century, would you believe? At that time, local craftsmen first built an iron forge just behind the village here, on the bend in the river. By the seventeenth and eighteenth centuries the region's rivers supported more than a hundred and sixty water mills - and many of these continued to operate well into the nineteenth century. But then the steam engine was invented and then the railways came and the centres of industry were able to move away from the rivers and the countryside and into the towns. So, industrial villages like this one became very rare. So that's the history for you. If you'd like any more information, you can ask me some questions, or you can read further in our excellent guide book. Now I'm going to give you a plan of the site and I'd just like to point out where everything is and then you can take a look at everything for yourself. I've already pointed out the river, which is on the left. And of course, running along the bottom is Woodside Road, got it? OK. Now we're standing at the entrance, see it at the bottom, and immediately to our right is the Ticket Office. You won't need that because you've got your group booking, but just past it are the toilets - always good to know where they are. In front of us is the car park, as you can see, and to the left, by the entry gate is the Gift Shop. That's where you can get copies of the guide, like this one here. Now, beyond the car park all the buildings are arranged in a half circle with a yard in the middle. The big, stone building at the top is the main Workshop. That's where the furnace is and where all the metal was smelted and the tools were cast, as you'll be able to see. Now, in the top right-hand corner, that building with bigger windows is the Showroom, where samples of all the tools that were made through the ages are on display. In the top left corner is the Grinding Shop, where the tools were sharpened and finished. And on one side of that you can see the Engine Room and on the other is the Cafe, which isn't an antique, you'll be pleased to know, though they do serve very nice old-fashioned teas. The row of buildings you can see on the left are the cottages. These were built for the workers towards the end of the eighteenth century and they're still furnished from that period so you can get a good idea of ordinary people's living conditions. Across the yard from them, you can see the stables where the horses were kept for transporting the products. And the separate building in front of them is the Works Office and that still has some of the old accounts on display. Right, if anyone wants a guided tour then I'm starting at the Engine Room. If you'd like to come along, this way please, ladies and gentlemen.
Part 3 — A tutorial about an assignment extension
MELANIE: Excuse me, Dr Johnson. May I speak to you for a minute? DR JOHNSON: Sure. Come in. MELANIE: I'm Melanie Griffin. I'm taking your course in Population Studies. DR JOHNSON: Right. Well, Melanie, how can I help you? MELANIE: I'm ... having a bit of trouble with the second assignment, and it's due in twelve days. DR JOHNSON: What sort of trouble are you having? Is the assignment question a problem? MELANIE: Well, that's part of the problem. I'm also having - been having - trouble getting hold of the books. I've been to the library several times, and all the books are out. DR JOHNSON: Sounds like you should have started borrowing books a bit earlier. MELANIE: Well, I had a really big assignment due in for another course, and I've been spending all my time on that, and I thought ... DR JOHNSON: ... You might get an extension of time to finish your assignment for me? MELANIE: If that's possible, but I don't know ... DR JOHNSON: Well, yes, it is possible, but extensions are normally given only for medical or compassionate reasons, otherwise it's really a question of organising your study, and we don't like giving extensions to students who simply didn't plan their work properly. What did you get for your first assignment? MELANIE: I got eighty-seven per cent. DR JOHNSON: Mmm, yes, you did very well indeed, so obviously you can produce good work. MELANIE: I don't think I'll need too much extra time, as long as I can get hold of some of the important references. DR JOHNSON: Well, since you did so well in your first assignment, I'm prepared to give you an extra two weeks for this one, so that'll mean you'll need to submit it about a month from now. MELANIE: Thank you. DR JOHNSON: Now, what about the reading materials? Have you checked out the journal articles in the list? MELANIE: Umm, no, not yet, there were about twenty of them, and I wasn't sure which ones would be most useful or important. DR JOHNSON: Well, they're all useful, but I don't expect anyone to read them all, because a number of them deal with the same issues. Let me give you some suggestions. The article by Anderson and Hawker is really worth reading. MELANIE: Right, I'll read that one. DR JOHNSON: You should also read the article by Jackson, but just look at the part on the research methodology - how they did it. MELANIE: OK ... Jackson, got that ... DR JOHNSON: And if you have time, the one by Roberts says very relevant things, although it's not essential. MELANIE: So, OK, if it's useful, I'll try and read that one ... DR JOHNSON: Now, the one by Morris. I wouldn't bother with that at this stage, if I were you. MELANIE: OK, I won't bother with Morris. Oh, now, someone told me the article by Cooper is important. DR JOHNSON: Well, yes, in a way, but just look at the last part, where he discusses the research results. And lastly, there's Forster - I can't think why I included that one. It's not bad and could be of some help, but not that much. DR JOHNSON: Now, let's deal with the assignment question. What's the problem there? MELANIE: It's the graph on page two. DR JOHNSON: What seems to be the problem? It's just the bar graph showing reasons why people change where they live. MELANIE: Well, I've got a photocopy but the reasons at the bottom are missing. DR JOHNSON: Ah, OK. Look at the first bar on the graph - now that indicates the number of people who move because they want more space. MELANIE: Oh I see ... bar one. OK ... Now what about the next bar? DR JOHNSON: Bar two is to do with the people living nearby disturbing them, so they chose to move away to somewhere quieter. Now let's look at bar number three ... another reason people change their place of living is because they want to be closer to the city. MELANIE: OK. Proximity to the city is an issue ... DR JOHNSON: Now ... bar number four refers to problems when the owner of the property won't help fix things that go wrong. In other words, the owner is not helpful and so the tenants move out. MELANIE: OK ... Now what about bar five? DR JOHNSON: Bar five is about those people who move because they need a bus or train to get them into the city or to go to work. MELANIE: OK ... And bar six? DR JOHNSON: Bar number six is interesting. That reason was given quite a lot - people moving because they wanted to be in a more attractive neighbourhood. MELANIE: Oh, yes, thank you very much.
Part 4 — The urban landscape
Good day, ladies and gentlemen. I have been asked today to talk to you about the urban landscape. There are two major areas that I will focus on in my talk: how vegetation can have a significant effect on urban climate, and how we can better plan our cities using trees to provide a more comfortable environment for us to live in. Trees can have a significant impact on our cities. They can make a city, as a whole, a bit less windy or a bit more windy, if that's what you want. They can make it a bit cooler if it's a hot summer day in an Australian city, or they can make it a bit more humid if it's a dry inland city. On the local scale - that is, in particular areas within the city - trees can make the local area more shady, cooler, more humid and much less windy. In fact trees and planting of various kinds can be used to make city streets actually less dangerous in particular areas. How do trees do all that, you ask? Well, the main difference between a tree and a building is a tree has got an internal mechanism to keep the temperature regulated. It evaporates water through its leaves, and that means that the temperature of the leaves is never very far from our own body temperature. The temperature of a building surface on a hot sunny day can easily be twenty degrees more than our temperature. Trees, on the other hand, remain cooler than buildings because they sweat. This means that they can humidify the air and cool it - a property which can be exploited to improve the local climate. Trees can also help break the force of winds. The reason that high buildings make it windier at ground level is that, as the wind goes higher and higher, it goes faster and faster. When the wind hits the building, it has to go somewhere. Some of it goes over the top and some goes around the sides of the building, forcing those high level winds down to ground level. That doesn't happen when you have trees. Trees filter the wind and considerably reduce it, preventing those very large strong gusts that you so often find around tall buildings. Another problem in built-up areas is that traffic noise is intensified by tall buildings. By planting a belt of trees at the side of the road, you can make things a little quieter, but much of the vehicle noise still goes through the trees. Trees can also help reduce the amount of noise in the surroundings, although the effect is not as large as people like to think. Low-frequency noise, in particular, just goes through the trees as though they aren't there. Although trees can significantly improve the local climate, they do however take up a lot of space. There are root systems to consider and branches blocking windows and so on. It may therefore be difficult to fit trees into the local landscape. There is not a great deal you can do if you have what we call a street canyon - a whole set of high-rises enclosed in a narrow street. Trees need water to grow. They also need some sunlight to grow and you need room to put them. If you have the chance of knocking buildings down and replacing them, then suddenly you can start looking at different ways to design the streets and to introduce ... (fade out)
Comments
Loading comments…