シャドーイング練習: Plastic Isn’t The Problem You’ve Been Made To Believe - 動画で英語スピーキングを学ぶ

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Plastic isn't the problem we've been told it is.

We've been told it's this terrible stuff that won't naturally rot away

and contaminate our environment for hundreds if not thousands of years.

But recent research has made it increasingly clear that this just isn't so.

The true stories both better and worse.

I have a brief summary.

Environmental protection organizations have preached for half a century that plastic degrades very, very slowly.

The Worldwide Fund for Nature, for example, says that plastic bottles last 450 years.

According to the United Nations Environment Program, it can take thousands or even tens of thousands of years for plastic to degrade.

And according to Greenpeace, plastic never goes away.

You may ask, indeed, I think you should ask, how do they know, given that plastic didn't become widely used until about a century ago?

And haven't any of these people ever seen plastic garden furniture?

You can basically see the stuff rotting away with your own eyes.

So what's really going on?

We think of plastic as the epitome of an artificial product, but I think that artificial is not a helpful terminology.

We're part of nature and I don't see why something we produce is any less natural than what other living beings produce.

I think it makes more sense to refer to plastic as man -made

or human -made if you want to be politically super correct.

Plastics made of long chains of molecules called polymers and primarily produced from fossil fuels.

That makes it what chemists call organic.

Though plastics that we use in everyday life almost always contain other chemicals, many inorganic, to add color or elasticity or stability.

That's right, plastics often have other chemicals added to make them more durable.

This already tells you that the idea that plastics don't decay is somewhat questionable.

Indeed, we know today that plastics begin to break down into smaller and smaller fragments incredibly quickly,

giving rise to micro and later nanoplastics that have now spread around the entire globe.

When this was first reported in 1972 by Edward Carpenter and Kenneth Smith, Other scientists weren't just surprised.

They were openly hostile.

According to Carpenter, the colleagues thought that the paper should never have been published and he was told to stick to biology.

They were perfectly right, though.

Micro and nanoplastics are now to be found anywhere from the Sahara Desert to the Arctic to the oceans.

We literally eat and breathe the stuff.

Now, that plastic fragments doesn't mean that it entirely chemically decays,

but it does effectively increase the surface of the plastic and that means it becomes much more susceptible to sunlight, abrasion and chemical reactions.

The shedding of micro and nanoplastics happened surprisingly quickly.

A 2016 researcher showed

that it took less than two months for a plastic coffee cup to shed nanoparticles

when in water and exposed to UV light.

Last year then, a group from Northeastern University measured how fast these particles undergo photodegradation in water,

that is, how fast the polymers break apart into carbon dioxide other gases and other organic and inorganic substances.

They estimated that a polystyrene particle with about one millimeter diameter would need about five and a half years,

whereas a polypropylene particle with merely 100 nanometers diameter would fall apart in about half a year.

This is roughly compatible with a finding from 2024,

which found that a millimeter -sized plastic particle takes about half a year to decompose in water illuminated by light.

It's also roughly compatible with a 2026 study from a Chinese group

that looked at the decay of thin sheets of polypropylene and found a half -life of about a month.

These are all data for specific types of plastic under specific circumstances.

They don't tell us, for example, what happens to trash buried in soil.

But my takeaway is that it's probably not going to take 10 ,000s of years for plastic to decompose.

Let me be clear that I'm not saying that plastic is not a problem.

It very clearly is.

It's terrible for birds and fish who swallow it and even if it dissolves, it leaves behind potentially toxic chemicals.

I'm not saying that plastic is not a problem.

I'm just saying that the problem isn't that plastic doesn't decay.

Indeed, I'd go so far to say that it'd be better if it wouldn't decay, that'd make it easier to remove,

and it'd keep the carbon stored.

We have also known for a decade that some bacteria have evolved the ability to digest plastic.

There's also been a story that mealworms can do this too, but this hasn't been independently reproduced and has remained somewhat controversial.

In any case, seeing that plastics contain a lot of usable chemical energy,

it seems likely to me that some soil microbes will soon learn to digest it.

What about the health effects of ingesting microplastics?

I went through this in a recent video.

And to make a long story short, there's currently no convincing evidence that microplastics have detrimental health effects.

This does not mean they have no health effects.

It merely means that the evidence is weak or non -existent.

The story

that plastic could take tens of thousands of years to rot was widely spread despite not having any evidence behind it whatsoever.

It's only now that we get to see the numbers.

Unfortunately, it might just be that the myth will live longer than the plastic itself.

I find it difficult to think about how much we've damaged our environment, but I feel much better since I have joined

Planet Wild, because it shows me that together we can help nature recover.

Planet Wild is a community -based environmental protection organization.

They're funding the restoration of ecosystems to preserve our nature and wildlife by partnering with different organizations every month.

I've been part of their community for years now, and I've been really impressed by their work.

They document all their projects with video reports that you can find right here on YouTube, so you can see your impact right away.

In their recent mission, they brought wildlife back to the city of Bristol by planting wetlands.

This is a lovely example of the hands -on work that

Planet Wild is doing.

Joining Planet Wild is a simple yet effective way to help this planet.

So if you want to do something that matters, join Planet Wild.

You can contribute whatever amount feels right.

And if you're one of the next 100 people to sign up using my code, I'll cover your first month.

Just scan the QR code or click on the link in the description.

And don't worry, you can cancel any time.

If you want to see them in action first, watch their mission Restoring Wetlands.

Thanks for watching.

See you tomorrow.

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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「Plastic Isn’t The Problem You’ve Been Made To Believe」を教材にしています。繰り返し出てくる語は次のとおりです：plastic, planet, decay, chemical, Wild。この動画には、シャドーイング用の文が86文、単語が1136語あります。音声の長さは7:14です。話す速さは1分あたり約157語で、日常会話に近い自然なペースです。英語の頻出3,000語に含まれる単語は81%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語	発音	意味
decay 名詞	/diˈkeɪ/	腐敗
particle 名詞	/ˈpɑɹtək(ə)l/	粒子
microwave 名詞	/ˈmaɪkɹoʊˌweɪv/	マイクロ波, マイクロウェーブ
soil 名詞	/sɔɪl/	土, 土壌
organic 形容詞	/ɔːˈɡænɪk/	有機
merely 副詞	/ˈmɪəli/	単に, ばかり
wildlife 名詞	/ˈwaɪldlaɪf/	野生動物
artificial 形容詞	/ˌɑː.tɪˈfɪʃ.əl/	人工の
diameter 名詞	/daɪˈæmɪdɚ/	直径
digest 動詞	/daɪˈd͡ʒɛst/	消化する
polymer 名詞	/ˈpɑ.lɪ.mɚ/	重合体, 高分子
fragment 名詞	/ˈfɹæɡmənt/	断片, 破片
naturally 副詞	/ˈnæt͡ʃ.(ə.)ɹə.li/	勿論
thin 形容詞	/ˈθɪn/	薄い, 細い
refer 動詞	/ɹɪˈfɜː/	問い合わせる

動画に出てくる句動詞

単語	意味
go away 動詞	去る, 出る
leave behind 動詞	置き忘れる

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型	動画での表現
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している	we've been told · has made · have preached
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる	we've been told · have been published · be found

注意したい発音

話し手はdon't, I'm, isn'tなど、短縮形や弱形を31回使っています。聞こえたとおりの短い形で発音しましょう。

「th」の音: thin /ˈθɪn/, breathe /bɹiːð/, myth /mɪθ/
「sh」と「zh」の音: artificial /ˌɑː.tɪˈfɪʃ.əl/, trash /tɹæʃ/, sheet /ʃit/, potentially /pəˈtɛnʃ(ə)li/, controversial /ˌkɑn.tɹəˈvɝ.ʃəl/
長い単語（アクセントの位置に注意）: artificial /ˌɑː.tɪˈfɪʃ.əl/, diameter /daɪˈæmɪdɚ/, compatible /kəmˈpæt.ə.bəl/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/, primarily /ˈpɹaɪ.mə.ɹə.li/

日本語話者が苦手な音：

/r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: particle /ˈpɑɹtək(ə)l/, roughly /ˈɹʌf.li/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/, primarily /ˈpɹaɪ.mə.ɹə.li/, incredibly /ɪŋˈkɹɛdɪbli/
/v/ — /b/ にならないように、上の歯を下唇に当てる: microwave /ˈmaɪkɹoʊˌweɪv/, everyday /ˈɛvɹiˌdeɪ/, recover /ɹɪˈkʌvɚ/, convince /kənˈvɪns/, controversial /ˌkɑn.tɹəˈvɝ.ʃəl/
/f/ — 「フ」ではなく、上の歯と下唇で出す: roughly /ˈɹʌf.li/, wildlife /ˈwaɪldlaɪf/, artificial /ˌɑː.tɪˈfɪʃ.əl/, fragment /ˈfɹæɡmənt/, refer /ɹɪˈfɜː/

この動画での練習方法

まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
自分の声を録音して元の音声と比べます。decay, particle, microwaveなどの単語に特に注意しましょう。

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。

シャドーイングのやり方: ステップ別の完全ガイドを読む →

シャドーイング練習: Plastic Isn’t The Problem You’ve Been Made To Believe - 動画で英語スピーキングを学ぶ

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