쉐도잉 연습: How does extreme heat affect your body? - Carolyn Beans - YouTube로 영어 말하기 배우기

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The year is 2050 and your morning is not off to a good start.
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The year is 2050 and your morning is not off to a good start.
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School is closed for yet another heat day, meaning the kids need to stay home and the AC needs to stay on.
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Your usual babysitter can’t come help because the rails for their commuter train were warped by the heat.
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And to make matters worse, your dog is desperate for a walk, but the pavement is hot enough to give third degree burns to any paw or person that touches it.
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In many parts of the world, this sweltering future is already here.
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On average, heat waves are happening more often with greater intensity and for longer durations.
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But according to a 2022 projection, by 2050, Earth’s mid-latitudes could be experiencing extreme heat between 90 and 180 days a year, with tropical regions enduring even more.
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So, how hot is too hot, and what can people do to handle the heat?
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While human bodies are decent at managing temperature, our cooling mechanisms only work under the right conditions.
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When air temperatures climb, the hypothalamus tells blood vessels near the skin to widen, allowing more blood to flow near the body's surface and release heat.
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This hormonal cascade also turns on our sweat glands.
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As sweat evaporates, it pulls the heat from our skin.
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But if humidity is high, the rate of evaporation slows and eventually stops.
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Scientists use this principle to track humidity with a metric called wet-bulb temperature, in which they wrap a wet, room temperature cloth around a thermometer to see if evaporation will lower the reading.
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If it doesn't, it's too humid for sweat to cool us off.
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A wet-bulb temperature of roughly 35°C is generally considered the limit of human survival, though current temperatures rarely reach this threshold.
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The US National Weather Service uses the relationship between humidity and air temperature as the basis for their heat index.
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As those two metrics rise, so too does the heat index; and heat is considered dangerous if the index climbs above 39.4°C.
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That’s 103°F.
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But even a lower heat index can be hazardous over multiple days.
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A heat wave is a streak of two or more days of unusually hot weather for a place and season.
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For example, a string of 32°C days in Houston, Texas, is standard in the summer, but would constitute a heat wave in March.
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And the impact of these events touches nearly every aspect of daily life.
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Imagine a June heat wave strikes a tropical city.
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The first to experience effects are outdoor workers.
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Their excessive sweating leads to dehydration and muscle pain known as heat cramps.
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If they push on, their conditions could worsen to heat exhaustion and even heat stroke— a life-threatening ailment that occurs when a body’s temperature exceeds 40°C.
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Medical emergency calls spike across the city, often for children and people who are pregnant or elderly.
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The heat also increases hospital visits for heart, kidney, and lung-related conditions, creating an influx of patients that threatens to overwhelm medical providers.
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Over the following week, the city slows to a crawl.
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Schools and construction sites close.
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Airplanes need to reduce their weight limits to take off, bumping countless travelers from their flights.
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Restaurants shut down as overheated kitchens become unbearable.
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Residents who remain inside with air conditioners stay safe.
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But blasting AC isn’t cheap, and many families have to choose between keeping cool and staying fed.
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Either way, if the heat continues, the stress of these air conditioners could overwhelm the power grid, potentially leading to city-wide outages.
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These consequences are all very real.
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Each year, close to 500,000 people die due to excessive heat, and these extreme conditions are only growing more common.
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We can limit medical impacts by seeking help for heat-related illnesses, staying hydrated, and keeping people cool through public access to water and AC.
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But don’t let anyone tell you 1 to 2 degrees doesn’t matter.
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It will change our very way of life.

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핵심 어휘 및 구문

  • heat wave (폭염)
  • humidity (습도)
  • heat exhaustion (열탈진)
  • heat stroke (열사병)
  • wet-bulb temperature (습구온도)
  • dehydration (탈수)
  • hazardous (위험한)
  • medical emergency (응급 의료)

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