Climate change

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교육자를 위해: Climate change(KS3 Geography, Physical Geography)을(를) 위한 바로 쓸 수 있는 수업 슬라이드, 복습 노트 — 수업에 사용하거나, 학습자들이 실시간 게임으로 즐기는 인터랙티브 클래스 활동으로 진행하세요.

수업 노트

What is Climate Change?

  • Climate change refers to long-term changes in Earth's climate, including both global warming and its wider effects, such as changes in rainfall patterns.
  • Global warming is the ongoing increase in global average surface temperature.
  • Climate change can also include natural changes that have happened throughout Earth's history, not just those caused by humans.
  • Anthropogenic climate change is the term used for climate change caused by human activities.

Evidence for Climate Change

  • Ice cores and tree rings are natural records (climate proxies) that provide evidence of past climates.
  • Thermometer records began around 1850 and provide direct measurements of global temperature.
  • The Last Interglacial, around 125,000 years ago, was 0.5–1.5 °C warmer than before global warming began, with sea levels 5–10 metres higher.
  • The most recent glacial maximum, 20,000 years ago, was 5–7 °C colder, with sea levels over 125 metres lower than today.
  • The current interglacial period began 11,700 years ago, when temperatures stabilised and agriculture started.
  • Historical periods like the Medieval Warm Period and the Little Ice Age did not occur at the same time across all regions.

Natural Causes of Climate Change

  • Over the last few million years, Earth's climate has naturally cycled through ice ages.
  • Natural factors, such as changes in Earth's orbit, volcanic activity, and variations in solar output, can cause climate to change.
  • Past climate changes, like the ice ages, were caused by natural processes, not human activities.

The Enhanced Greenhouse Effect

  • Greenhouse gases absorb heat that Earth radiates after warming from sunlight, warming the lower atmosphere.
  • Human activities, especially burning fossil fuels (coal, oil, natural gas) since the Industrial Revolution, have increased greenhouse gas concentrations.
  • Deforestation and some agricultural and industrial practices also release greenhouse gases.
  • The atmosphere now has roughly 50% more carbon dioxide than at the end of the pre-industrial era, reaching levels not seen for millions of years.
  • This human-driven increase in greenhouse gases is known as the enhanced greenhouse effect.

Impacts on the Environment

  • Heat waves and wildfires are becoming more common.
  • The Arctic is warming faster than other regions, leading to thawing permafrost, retreat of glaciers, and decline in sea ice.
  • Higher temperatures are causing more intense storms, droughts, and other weather extremes.
  • Rapid environmental change in mountains, coral reefs, and the Arctic is forcing many species to relocate or become extinct.
  • Even if warming is limited, some effects will continue for centuries, including ocean heating, ocean acidification, and sea level rise.

Impacts on People

  • Climate change threatens people with increased flooding, extreme heat, food and water scarcity, more disease, and economic loss.
  • Human migration and conflict can also result from climate change impacts.
  • The World Health Organization calls climate change one of the biggest threats to global health in the 21st century.
  • Poorer communities are responsible for a small share of global emissions but are the most vulnerable and have the least ability to adapt.

Mitigation

  • Mitigation means reducing the causes of climate change, mainly by cutting greenhouse gas emissions.
  • Fossil fuels can be phased out by ending subsidies, conserving energy, and switching to renewable energy sources like wind, solar, hydro, and nuclear power.
  • Cleanly generated electricity can replace fossil fuels for transport, heating, and industry.
  • Carbon can be removed from the atmosphere by increasing forest cover and using farming methods that store carbon in soil (carbon capture).
  • International agreements, such as the 2015 Paris Agreement, aim to keep warming well under 2 °C, though current pledges would still lead to about 2.8 °C by 2100.

Adaptation

  • Adaptation means adjusting to the effects of climate change to reduce risks.
  • Examples include flood control measures and drought-resistant crops.
  • Adaptation can partially reduce climate change risks, but some limits to adaptation have already been reached.
  • Poorer communities often have the least ability to adapt and are most vulnerable.

Key Terminology

  • Global warming refers only to the increase in global average surface temperature.
  • Climate change describes both global warming and its effects on Earth's climate system, such as changes in precipitation.
  • Anthropogenic climate change is climate change caused by human activities.
  • Terms like climate crisis or climate emergency are sometimes used to emphasise the urgency of climate change.

슬라이드

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연습 문제

무료 미리 보기 — 63개 중 8개 문제. 가입하면 전부 볼 수 있어요.
  1. 1.Which gas is described as the main gas driving present-day global warming?

    Easy
    • ACarbon dioxide
    • BOxygen
    • CNitrogen
    • DHelium
  2. 2.Approximately how much more carbon dioxide does Earth's atmosphere contain now compared with the end of the pre-industrial era?

    Easy
    • A10% more
    • B25% more
    • C50% more
    • D100% more
  3. 3.Which human activity is the main driver of the modern rise in global temperatures?

    Medium
    • AVolcanic eruptions
    • BBurning fossil fuels
    • CChanges in solar output
    • DNatural ice age cycles
  4. 4.Which international agreement, made in 2015, committed nations to keep global warming well under 2 °C?

    Medium
    • AKyoto Protocol
    • BParis Agreement
    • CMontreal Protocol
    • DCopenhagen Accord
  5. 5.Which of the following are lines of evidence for past climate change? (Select all that apply.)

    Medium
    • AIce cores
    • BTree rings
    • CTemperature records
    • DVolcanic eruptions
    • EFossil fuel reserves
  6. 6.Which of the following are effects of climate change that will continue for centuries even if future warming is minimised? (Select all that apply.)

    Hard
    • AOcean heating
    • BOcean acidification
    • CSea level rise
    • DIncreased volcanic activity
    • EReduced solar output
  7. 7.The World Health Organization calls climate change one of the biggest threats to global health in the 21st century.

    Easy

    True or false?

  8. 8.The term 'global warming' became more popular after NASA climate scientist James Hansen used it in his 1988 testimony in the U.S. Senate.

    Easy

    True or false?

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