シャドーイング練習: When will the next mass extinction occur? - Borths, D'Emic, and Pritchard - YouTubeで英語スピーキングを学ぶ
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About 66 million years ago, something terrible happened to life on our planet.
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About 66 million years ago, something terrible happened to life on our planet.
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Ecosystems were hit with a double blow as massive volcanic eruptions filled the atmosphere with carbon dioxide and an asteroid roughly the size of Manhattan struck the Earth.
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The dust from the impact reduced or stopped photosynthesis from many plants, starving herbivores and the carnivores that preyed on them.
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Within a short time span, three-quarters of the world's species disappeared forever, and the giant dinosaurs, flying pterosaurs, shelled squids, and marine reptiles that had flourished for ages faded into prehistory.
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It may seem like the dinosaurs were especially unlucky, but extinctions of various severities have occurred throughout the Earth's history, and are still happening all around us today.
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Environments change, pushing some species out of their comfort zones while creating new opportunities for others.
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Invasive species arrive in new habitats, outcompeting the natives.
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And in some cases, entire species are wiped out as a result of activity by better adapted organisms.
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Sometimes, however, massive changes in the environment occur too quickly for most living creatures to adapt, causing thousands of species to die off in a geological instant.
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We call this a mass extinction event, and although such events may be rare, paleontologists have been able to identify several of them through dramatic changes in the fossil record, where lineages that persisted through several geological layers suddenly disappear.
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In fact, these mass extinctions are used to divide the Earth's history into distinct periods.
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Although the disappearance of the dinosaurs is the best known mass extinction event, the largest occurred long before dinosaurs ever existed.
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252 million years ago, between the Permian and Triassic periods, the Earth's land masses gathered together into the single supercontinent Pangaea.
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As it coalesced, its interior was filled with deserts, while the single coastline eliminated many of the shallow tropical seas where biodiversity thrived.
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Huge volcanic eruptions occurred across Siberia, coinciding with very high temperatures, suggesting a massive greenhouse effect.
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These catastrophes contributed to the extinction of 95% of species in the ocean, and on land, the strange reptiles of the Permian gave way to the ancestors of the far more familiar dinosaurs we know today.
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But mass extinctions are not just a thing of the distant past.
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Over the last few million years, the fluctuation of massive ice sheets at our planet's poles has caused sea levels to rise and fall, changing weather patterns and ocean currents along the way.
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As the ice sheets spread, retreated, and returned, some animals were either able to adapt to the changes, or migrate to a more suitable environment.
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Others, however, such as giant ground sloths, giant hyenas, and mammoths went extinct.
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The extinction of these large mammals coincides with changes in the climate and ecosystem due to the melting ice caps.
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But there is also an uncomfortable overlap with the rise of a certain hominid species originating in Africa 150,000 years ago.
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In the course of their adaptation to the new environment, creating new tools and methods for gathering food and hunting prey, humans may not have single-handedly caused the extinction of these large animals, as some were able to coexist with us for thousands of years.
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But it's clear that today, our tools and methods have become so effective that humans are no longer reacting to the environment, but are actively changing it.
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The extinction of species is a normal occurrence in the background of ecosystems.
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But studies suggest that rates of extinction today for many organisms are hundreds to thousands of times higher than the normal background.
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But the same unique ability that makes humans capable of driving mass extinctions can also enable us to prevent them.
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By learning about past extinction events, recognizing what is happening today as environments change, and using this knowledge to lessen our effect on other species, we can transform humanity's impact on the world from something as destructive as a massive asteroid into a collaborative part of a biologically diverse future.
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文脈と背景
この動画では、大規模な絶滅事件についての解説が行われています。約6600万年前、地球上で発生した壮大な環境変化の中で、恐竜を含む多くの種が姿を消しました。このような現象は過去にも複数回発生しており、現在も私たちの周りで種の絶滅が進行しています。環境が変わることで、生物は新たな挑戦を強いられ、適応できなかった種は絶滅の危機にさらされます。この動画を通じて、過去の絶滅事件を学び、現代の環境変化がどのように生物に影響を及ぼしているかを深く理解することができます。
日常会話のためのトップ5フレーズ
- 生態系が直面する脅威: "Ecosystems are hit with a double blow."
- 適応の難しさ: "Some species are pushed out of their comfort zones."
- 絶滅の過程: "Mass extinctions are used to divide the Earth's history."
- 人間の影響: "Humans are actively changing the environment."
- 未来への希望: "We can transform humanity's impact into a collaborative part of a biologically diverse future."
ステップバイステップシャドウイングガイド
この動画の内容を理解し、発音を改善するために以下の手順を試してください。これらの方法はshadow speechやshadowspeakに基づいており、IELTS スピーキング対策にも有効です。
- 視聴前準備: 動画のテーマをリサーチし、大規模な絶滅事件について基本的な知識を持ちましょう。これにより、内容の理解が深まります。
- 初回視聴: 動画を一度通して見て、大まかな内容を把握します。
- シャドーイング実践: 文章ごとに区切り、スピーカーの発音を真似してみましょう。特に、新しい単語やフレーズに注目し、英語の発音を良くすることに焦点を当てます。
- 反復練習: 苦手な部分を何度も繰り返し発音し、自然なリズムを手に入れましょう。
- 内容の復習: 動画を再視聴し、理解を深めます。特に、重要なフレーズを使って自分の考えや意見を表現する練習をします。
これらのステップを通じて、英語を学ぶ過程がより充実したものになるでしょう。YouTubeで英語学習を行い、自己表現能力を向上させてください。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。