Land productivity limiting human population | Cosmology & Astronomy | Khan Academy

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  • เผยแพร่เมื่อ 12 ม.ค. 2025

ความคิดเห็น • 51

  • @GreenLoveBreda
    @GreenLoveBreda 13 ปีที่แล้ว

    Hey Sal great vid! you forgot to say 2 things: in stage 4, multiple Calories of oil
    are used to create 1 Cal of nutrition, so that can't go on forever. And you forgot stage 5: sustainable permaculture farming/gardening with even higher yields/km^2 than stage 4 and without the use of diesel, pesticides or chem fertilizers!:) In alot of developing countries these techniques already work really well, maybe we'll be the developing countries in the future, with our irresponsible wasting of resources

  • @sommmmm1
    @sommmmm1 13 ปีที่แล้ว

    i love your hand writing, seriously

  • @SalsaTiger83
    @SalsaTiger83 13 ปีที่แล้ว

    I think a few people got confused about the square kilometer. I think he means only the land used for producing/gathering the food, not all the land in a country. Also population growth today is - luckily - limited by education in many countries and the third world will hopefully follow too.

  • @goldensilverstar
    @goldensilverstar 13 ปีที่แล้ว

    LOL. WHILE HE UPLOADED THIS VIDEO, I WAS ALREADY WATCHING KHANS OTHER VIDEOS TO PREPARE ME FOR MY EXAMS, YOU ROCK MAN KEEP MAKING MORE INTERESTING VIDEOS!

  • @meanmanturbo
    @meanmanturbo 13 ปีที่แล้ว

    Now, this would have been be a good place to introduce our good old friend Malthus and the Malthusian trap. And how he was defeated by industrialization.

  • @Upthemeds
    @Upthemeds 13 ปีที่แล้ว

    Another message that this video teaches is if the world were to grow 100% organic food, it would not be enough to support the population of humankind

  • @cool70200
    @cool70200 13 ปีที่แล้ว

    I've been thinking about this caloric intake, along with nutrient and water requirement myself.
    Interesting points mr Sal.

  • @OliviaSBee
    @OliviaSBee 13 ปีที่แล้ว

    Ah - Malthus' theory? One of the only things I can remember from my Geography lessons :) Love your vids ! x

  • @pommyrooter
    @pommyrooter 13 ปีที่แล้ว

    Tower Aquaponic + Permaculture farms. A big helping hand.

  • @BOGOWA22
    @BOGOWA22 13 ปีที่แล้ว

    Try bug consumption. Easy to raise; high protein content. Given large enough scale, it might tilt the scale.

  • @lilcote93
    @lilcote93 13 ปีที่แล้ว

    this guys a genius.
    sal, what should i invest my money in?!

  • @TheGrapplingMonkey
    @TheGrapplingMonkey 13 ปีที่แล้ว

    Khan, can you site sources if somebody wants to read more?

  • @renukote
    @renukote 13 ปีที่แล้ว

    @Lleanlleawrg. You are warm, keep learning about that frequency, soon you will know about magnagas, along with other technologies that would prevent depopulation. Be happy humanity will live.

  • @TRYCLOPS1
    @TRYCLOPS1 13 ปีที่แล้ว

    Thanks!

  • @nab3042
    @nab3042 13 ปีที่แล้ว

    @BJ219 It's only true that modern humans have less leisure time because the things we consider necessary chores don't exist in a simpler life style or are of a different form (no need to vacuum if you live on a dirt floor). But you have to consider that the time spent working for "simpler" existence is much more labor intensive, and people who are forced to live like this due to poverty never have to work much harder than say a isolated tribe that chooses to live that way.

  • @Upthemeds
    @Upthemeds 13 ปีที่แล้ว

    @RespectMyHate I would say it is not a problem yet...ecology teaches us, with the simple study of deer and wolf populations, that they are keep it check by food available, however the lack of food means that some members of the population are starving to death. Wouldn't it be simpler to keep the over population in check, than to let others starve

  • @timan282
    @timan282 13 ปีที่แล้ว

    First!!! Great video.

  • @sashakid
    @sashakid 13 ปีที่แล้ว

    now with that take the fact that most people in those places where we have modern agroculture eat more than 2000 calories and now suddenly 900 people per km squred is actually killing the limit and those who live in african might get even less that 2000 calories some of their days

  • @CanadianTheGreatest
    @CanadianTheGreatest ปีที่แล้ว

    10:30 monaco not bangladesh bangladesh is actually only the 10th most densely populated country

  • @f0revern0ty0urs2
    @f0revern0ty0urs2 13 ปีที่แล้ว

    10:57 "if you don't get the population under control..."
    As the title says,the land productivity is limiting the population,so why could anyone else dare meddle with it?

  • @gangliums
    @gangliums 13 ปีที่แล้ว

    i actually like those numbers

  • @emerald1one1
    @emerald1one1 13 ปีที่แล้ว

    ok stop everything you consume , soon as you read this note .. move to the land in vid .. walk and eat the same .. then 6 month of wonderful knowledge gaining .. go to alaska or nwt and do the same there .. now do the same with a young family calorie counter.

  • @nab3042
    @nab3042 13 ปีที่แล้ว

    @BJ219 People did move to were the easier calories were, that is pretty much the story of human civilization. And desert nomads are supremely outnumbered. I'm not sure if I understood you correctly.

  • @DynastyJr
    @DynastyJr 13 ปีที่แล้ว

    Bahh...

  • @nab3042
    @nab3042 13 ปีที่แล้ว

    @chocobofarmer2021 Yes, but why assume this super advanced technological use for food production and not go as far as to assume we would assemble our future food at the simplest level for mass production (molecular production of sustenance). Sure, most people don't like the idea of a gray protein paste, but I’ll assume that we'll have the technology to make it palatable, (texture is just as important as taste).

  • @betolimoun
    @betolimoun 13 ปีที่แล้ว

    @jjpp1993 He does only need to know one single thing: How to think properly and apply it. :-)

  • @RiyadhElalami
    @RiyadhElalami 13 ปีที่แล้ว

    @jjpp1993 I think not, he is a genius I wish I could 1/10 of his knowledge.

  • @Saganist420
    @Saganist420 13 ปีที่แล้ว

    Actually, kind sir... Vatican would be the country with most people per square kilometer.

  • @NicholasBourgeois
    @NicholasBourgeois 13 ปีที่แล้ว

    A few talks with Bill Gates and now you preach Population Control?
    Wow, real eye opener!

  • @Phleemflam
    @Phleemflam 13 ปีที่แล้ว

    damn man your so smart i wish i had your brain lol

  • @corianderthal
    @corianderthal 13 ปีที่แล้ว

    Improve the quality of living before making more habitable land, especially in Africa.

  • @Ferdinand208
    @Ferdinand208 13 ปีที่แล้ว

    I'm sorry this video was far too long for what you were trying to say. The subject is very interesting though. It is weird that you don't mention kcal(kilo calories) but instead call it calories and Calories...

  • @HotPepperLala
    @HotPepperLala 13 ปีที่แล้ว

    H.G. for the rapper/gangster! lol

  • @syedtalhasxr
    @syedtalhasxr 13 ปีที่แล้ว

    tried to scroll down on my smartphone

  • @mechanicalbu11
    @mechanicalbu11 13 ปีที่แล้ว

    GMO inst all that it's cracked up to be. it not a save humanity technology. i have a question; where is that GMO crop i was promised as a child that can produce twice the yield on half the land? is it like that flying cars?

  • @ChristopherMarlowe
    @ChristopherMarlowe 13 ปีที่แล้ว

    900 Khans per square kilometer. Think about it.

  • @Lleanlleawrg
    @Lleanlleawrg 13 ปีที่แล้ว

    @renukote So you're saying that people don't need food, all they need is healing music. Okay. I'm gonna go ahead and treat you like a child because quite frankly that's what you are.

  • @TheBigCheezeIt
    @TheBigCheezeIt 13 ปีที่แล้ว

    @idiotrun1997 Some people in third world countries have many children to help with labor on farms and other physical labor needs for the family.

  • @kianshin55
    @kianshin55 12 ปีที่แล้ว

    Lol.where I come from,population density is around 6000 people/square kilometer.

  • @MarcusTexaco
    @MarcusTexaco 13 ปีที่แล้ว

    @akondude sociology

  • @goldensilverstar
    @goldensilverstar 13 ปีที่แล้ว

    Is he going to talk about how much fishing he does in Bangladesh, loool

  • @Wakeem5678
    @Wakeem5678 13 ปีที่แล้ว

    @jjpp1993

  • @Animelover-oo7cz
    @Animelover-oo7cz 5 ปีที่แล้ว

    Add translation in Arabic😢

  • @michaelsuede
    @michaelsuede 13 ปีที่แล้ว

    Technology has made such calculations irrelevant. watch?v=hjh97obNgUI

  • @jjpp3301
    @jjpp3301 13 ปีที่แล้ว

    dude, is there anything you don't know about???????????

  • @MiREU.T
    @MiREU.T 13 ปีที่แล้ว

    @f0revern0ty0urs2 babies come from people, not the land... there are some really fertile people.