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  • Hey there, welcome to Life Noggin.

    嗨,歡迎收看 Life Noggin。

  • There are currently over 7 billion humans inhabiting the Earth and that value is increasing exponentially.

    現今,地球上有超過 70 億人居住,而且一直呈指數增長。

  • So that has a lot of people wondering including me: "How many people can the Earth even hold?”


  • It's estimated that, by the end of the century, the human population will be over 10 billion.

    據估計,到本世紀末,人口將超過 100 億。

  • And scientists are unsure whether this will be sustainable or not.


  • To see why, let's start off by talking about my favorite subject: food.


  • If you were to take all the land being used to raise livestock and put it on one continent, it would take up all of Africa.

    如果可以把所有用來飼養牲畜的土地都放在一個大陸上,可以占據整個非洲 。

  • In fact, it would actually be greater than Africa--between 8 to 9 billion acres.

    其實,它會比非洲還要大——介於 80 億到 90 億英畝之間。

  • And if we did the same thing for crop production, it would take up an area about the size of South America.


  • But, after a while, the soil in these areas will degrade, meaning its fertility decreases.


  • And it erodes, rendering it useless for growing crops.


  • And not only that, but scientists are unsure if farmers could even maintain their current crop yields due to changes in the environment.


  • See, the global average of carbon dioxide emissions per person is about 5 metric tons per year.

    每年全球每人平均二氧化碳排放量約 5 公噸。

  • But for Americans, that average is closer to 17 metric tons per year.

    而美國人的平均則是,每年將近 17 公噸。

  • And remember, this is per person.


  • So, if we have about 3 billion more people living on this planet, and they all adopt a lifestyle similar to an American, the effects of global warming will be worsened even more.

    所以如果我們有超過 30 億人口生活在這個星球上,而他們的生活方式都和美國人相似的話,全球暖化造成的影響會更加嚴重。

  • In fact, it's projected that the temperature of the Earth will increase by 2 degrees Celsius by the end of the 21st century.

    事實上,預計到 21 世紀末,地球溫度將上升攝氏 2 度。

  • And with that increase comes more extreme weather conditions, which would inevitably disrupt food production.


  • So yeah, you know, not good.


  • Now, this can be partially remedied by everyone adopting a vegetarian diet, and reclaiming the land to grow more crops instead of raising livestock.


  • But the crops won't be enough to feed an infinite number of people.


  • In fact, some scientists predict that it would only be enough to feed 10 billion people.

    一些科學家預測那些農作物,只夠養活 100 億人口。

  • And more than likely, most people won't switch to a vegetarian diet.


  • After all, bacon is a beautiful thing that exists.


  • And bacon on pizza, oh my God.


  • But what about the amount of available water?


  • Humans are currently using up about 30 percent of the Earth's accessible renewable water supply, with the rest being used for agriculture.

    目前,人類使用地球上約 30% 的可再生水資源於民生用水,而剩餘的則是用於農業用水。

  • And the water available to some people in countries like Ethiopia, Cambodia, and Haiti isn't even clean enough to drink.


  • So, the amount reaching humans would have to increase with an increasing population.


  • So, to answer the original question: the Earth may be able to hold a large number of people, perhaps even over 10 billion.

    那麼,回到一開始的問題,答案是:地球也許能容納龐大的人口,甚至可能超過 100 億。

  • But the quality of those people's lives would be much different than they are right now.


  • So how many humans do you think the Earth can hold?


  • Or do you think we're already there?


  • Let me know in the comments below.


  • Make sure you come back every Monday for a brand new video.


  • As always, I'm Blocko and this has been Life Noggin.

    老話一句,我是 Blocko,這裡是 Life Noggin。

  • Don't forget to keep on thinking!


Hey there, welcome to Life Noggin.

嗨,歡迎收看 Life Noggin。

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地球能容納多少人呢? (How Many People Can The Earth Hold?)

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    Cindy Lin 發佈於 2020 年 08 月 21 日