都市のヒートアイランド現象についての講義の抜粋

態度、意見、推論

1. c) To introduce a familiar urban problem and assess ways of dealing with it彼女はヒートアイランド現象を紹介し、その原因を説明し、欠点も含めていくつかの対応策を比較検討しています。
2. b) Surfaces that absorb sunlight and release the heat after darkエンジンやエアコンの影響はわずかで、より大きな要因は石やアスファルトなどの表面だと述べています。
3. a) The problem might have been avoided with better knowledge「Had ... understood, they might have designed differently」という構文は、知識があれば以前の設計はもっと良くなり得たことを示しています。
4. d) It is helpful, but only under certain conditions木は効果があるものの、根と水のための余地がある場所に限られ、弱った木は何も冷やさないかもしれないと述べています。
5. c) They can create glare for people in the street反射する表面は、まぶしさを通りに跳ね返すことがあり、歩行者にとって望ましくないと述べています。
6. b) The hottest areas are often home to people least able to cope最も暑い通りには公園が最も少なく、そこにはしばしば高齢者や低所得の住民が住んでいると指摘しています。
7. d) To show that a simple, cheap measure can be valuable彼女は、その部屋は費用がほとんどかからず命を救うかもしれないと述べています。そのため、低コストで技術に頼らない対応の例になっています。
8. a) Compare two case studies and judge which approach is better2つの事例研究を読み、どちらのアプローチのほうが説得力があると思うか、その理由とともに判断するよう求めています。

細かい点を聞き取る

1. eight / 8講師は、その差が最大8度に達することがあると述べています。
2. water植物は葉から水分を失い、それが空気中の熱を奪うと述べています。
3. twelve / 12彼女が挙げている調査は、12の地区を対象にしていました。
4. three / 3それらは温度をおよそ3度下げました。
5. libraries一部の都市では、公共図書館に涼める部屋を設けたと述べています。

Doctor Haddad: Good morning, everyone. Today I want to look at a phenomenon that most of you will have felt without ever naming it: the urban heat island. In essence, a city is warmer than the countryside around it, and on a calm, clear night the difference can reach as much as eight degrees.

Doctor Haddad: Why does this happen? Not, as is often assumed, because cities generate so much heat of their own. Engines and air conditioners do contribute, but their share is modest. The larger factor is surface. Stone, brick and asphalt soak up sunlight all day and release it slowly after dark, whereas soil and vegetation stay cooler, partly because plants lose water through their leaves, which draws heat out of the air.

Doctor Haddad: Why does the night matter so much? Because the body needs a cool period in which to recover. When nights stay hot, people sleep badly, and the health effects build up over days rather than hours.

Doctor Haddad: Had planners understood all this a century ago, they might have designed very differently. Instead, we inherited streets lined with dark surfaces and hardly any shade. Rarely do we stop to consider that a single paved car park can raise the temperature of an entire neighbourhood by a degree or more.

Doctor Haddad: Now, a word of caution about the solutions. Planting trees is the obvious answer, and it does work, but only where there is room for roots and a reliable supply of water. A tree struggling in a narrow pavement pit may cool nothing at all. Pale roofs are cheaper and quicker. In a study of twelve districts, they lowered indoor temperatures by roughly three degrees. Yet reflective surfaces can also bounce glare into the street, which is hardly ideal for pedestrians.

Doctor Haddad: What I find most interesting, however, is the question of who bears the burden. Heat is not shared evenly. The hottest streets tend to be those with the fewest parks, and those are often where older residents and low-income families live. So the heat island is not merely an engineering puzzle; it is a question of fairness.

Doctor Haddad: I'm not suggesting that every problem has a technical fix. Some cities have simply opened cool rooms in public libraries during heatwaves, which costs very little and may well save lives. Others have asked residents to paint their own roofs white, with mixed results. For next week, I'd like you to read the two case studies on the reading list and decide which approach you find more convincing, and why.