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If there were only 100 animals on Earth

Here is what the Earth would look like if there were only 100 animals living on it.

For this video, we based ourselves on a scientific study published in the journal PNAS in 2018. The study estimates the total biomass on Earth, meaning the mass of life on Earth, as well as the distribution of this mass according to different groups of species (plants, animals, fungi…). The masses of the different groups were estimated from their carbon mass. Source 1 Source 2

We first focused on animals. We calculated the percentage of each group based on their total mass. For greater readability, these percentages were rounded to the nearest unit (except when the data justified a precise value). We also decided to present these percentage as the number of individuals (out of a total of 100 animals of equal mass).

Finally, we calculated the distribution of total biomass by adding non-animal groups such as plants or bacteria.

09/03/2019 4:01 PMupdated: 09/04/2019 3:15 PM
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37 comments

  • Erik N.
    09/03/2019 16:35

    Bolsonaro sees this video: 82% of the biomass? Perfect let's burn it all!

  • Ha R.
    09/03/2019 16:51

    2 % fungus!!🤔

  • Bagas K.
    09/03/2019 17:12

    I can hear the Indonesian government in the background saying "oh so environmental protection programs is not our priority after all"

  • Sherry S.
    09/03/2019 21:35

    Very interesting.

  • Christian S.
    09/04/2019 00:25

    Ratio of plants to bacteria is surprising

  • Lauren S.
    09/04/2019 01:56

    I really liked this. Thank you for sharing

  • Anna F.
    09/04/2019 02:15

    Impossible of only having a small of animals.. The microorganism & planktons would be in massive numbers! Who wrote this/ created this video clip?? ha :-)

  • Brut nature
    09/04/2019 08:46

    For this video, we based ourselves on a scientific study published in the journal PNAS in 2018. The study estimates the total biomass on Earth, meaning the mass of life on Earth, as well as the distribution of this mass according to different groups of species (plants, animals, fungi…). The masses of the different groups were estimated from their carbon mass. https://www.pnas.org/content/115/25/6506 https://www.pnas.org/.../1711842115.DC1/1711842115.sapp.pdf We first focused on animals. We calculated the percentage of each group based on their total mass. For greater readability, these percentages were rounded to the nearest unit (except when the data justified a precise value). We also decided to present these percentage as the number of individuals (out of a total of 100 animals of equal mass). Finally, we calculated the distribution of total biomass by adding non-animal groups such as plants or bacteria.

  • John G.
    09/05/2019 00:02

    You should do this as %ages.

  • Kirollos R.
    09/06/2019 03:41

    you're gonna have to know all these terms by the end of bio 1 xD

  • Lucy S.
    09/06/2019 06:23

    excellent presentation, thank you

  • McWhite S.
    09/06/2019 07:54

    I and one other person would have been the two people living on earth

  • Shivaji K.
    09/06/2019 08:52

    Very nice sir. Congratulations.keep it up.

  • Matias G.
    09/06/2019 17:36

    I was rhinking it was some planet earth type video ... like all the plants and fishys all cgi type stuff... wtf ... lol still a great video 👏👏

  • Khalid T.
    09/08/2019 00:06

    Please dear people of 🌎..... Think about occupied part of Kashmir..... India 🇮🇳 is killing innocent people of Kashmir.... Because The people of Kashmir don't want to live with India 🇮🇳..... India is not giving the right to the People of Kashmir accordingly to the regulation of UNO since 1948... The Kashmir issue is resied by British government since 1947 at the time of partation.... Kashmir is a flash point to start war between Paksitan and India.... and now India 🇮🇳 is going to start nuclear ☢️ war... As they have announced.... Dear People..... Please think about Kashmir issue... If the nuclear ☢️ powered war 💥💥💣💥💥 begins..... The rest World 🌎 will also destroy.... No more people will be left on Planet 🌐.......

  • Marcos L.
    09/08/2019 01:46

    Y va a llegar ese dia en menos de 10 años ...menos de 10 años tendremoa 100 especies....claro las que le sirven a este cancer.....

  • Zeki K.
    09/08/2019 04:39

    🤔

  • Tariq B.
    09/08/2019 11:26

    information for me

  • Koirala A.
    09/08/2019 15:55

    Those two human are sufficient to create this world again

  • Sreyasi M.
    7 days

    Excellent videos,en reach our knowledge.