Scientists Have Determined A 5°C Warmer Earth ‘Would Provide More Habitable Conditions’

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In a new study, scientists insist that since the Earth’s highest biomass and biodiversity exist in the warmest regions, “higher temperatures than currently existing on Earth” and a “higher water content (absolute humidity) in the atmosphere” seem to be “more favorable” to the planet’s inhabitants.

Until a few thousand years ago, when mammoths and wild horses ate exposed grass year-round along the coasts of the Arctic Ocean, the Sahara was grass- and lake-covered, teeming with fish and megafauna and even ancient civilizations. These much-warmer periods were obviously more hospitable to plants, animals, and humans.

Image Source: LiveScience

In addition to being several degrees warmer, the Earth’s climate was also much more humid and rainforest-like during the Early Holocene, or up until about 5,000 years ago. Rainforests have far more biodiversity than cooler climates do, of course. This is likely why this period is referred to as the “Humidity Optimum” by geologists (Ramos-Roman et al., 2018).

Image Source: Ramos-Roman et al., 2018

In a new study (Schulze-Makuch et al., 2020), scientists acknowledge that the “highest biomass and biodiversity is present in tropical rainforests, and the least in cold polar regions.” Therefore, higher temperatures – about 5°C warmer than today – would be more “favorable”  and “provide more habitable conditions.”

Unfortunately,  we humans have not demonstrated we have the capacity to significantly affect the climate in recent decades, and thus we will continue to stand idly by as the Earth’s climate changes without us.

Image Source: Schulze-Makuch et al., 2020



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23 responses to “Scientists Have Determined A 5°C Warmer Earth ‘Would Provide More Habitable Conditions’”

  1. bonbon

    We are not mammoths, arctic horses, nor just SUV drivers.
    Transaqua, to re-deploy water to Lake Chad will do in decades what millennia would do “naturally”.
    China’s experience: Helping transform an African desert into a garden
    https://news.cgtn.com/news/3d3d414d7855444e33457a6333566d54/index.html

    And NAWAPA will do for the Great American Desert the same, using nuclear power.
    NAWAPA XXI Animated Overview
    https://www.youtube.com/watch?v=1NdKsZrG9RA

    The financial oligarchy have succeeded in setting the narrative also for “skeptics”, who mostly still fall for the man-as-beast who must wait for rain and watch the desert growing. I have nothing against mammoths, and that 40,000 yBP grill found in Baja California must have had great steaks for weeks!

    I think we have learnt from the Holocene’s climate meanderings, progress or perish.

    Large-scale desalination with cheap fusion power, is also not a wooly mammoth’s primary concern, nor the financial oligarchy’s who have a great problem – they just cannot herd mankind into a corral .

  2. Javier

    The green Sahara had little to do with a warmer period in the Holocene. It was due to Milankovitch cycles. Due to changes in precession Northern Summer insolation was higher, the ITCZ was displaced north and the African monsoon reached the Sahara once a year allowing the existence of rivers, lakes and a savanna type of environment. This has been known since the 1980s.

    We are now in a low Northern Summer insolation, but in about 9000 years the Sahara should become green again.

    1. Phil Salmon

      Javier
      With rising CO2 the Sahara could green over sooner than that. It’s starting to already, slowly. This CO2 effect could be exerted independent of Milankovitch driven climate changes, although it would feedback into them of course as everything does.

      https://ptolemy2.wordpress.com/2020/10/04/co2-fertilisation-and-the-greening-of-the-sahara/

      The Sahara desert cut off subSaharan Africa from economic and technological developments around the Mediterranean, with lasting consequences. A greened over Sahara would profoundly change geopolitics and the status of Africa.

      1. bonbon

        And in a decade Lake Chad will be refilled – from runoff water of large rivers with canals.
        This Italian program has been delayed in Europe for 40 years – a colonial hangover.

        China is in the program now. It was adopted as the only possible economic infrastructure plan for the region.

        It will have profound consequences.

      2. Javier

        Phil,

        Yes there is some CO2 induced greening at the arid and semi-arid regions of the planet, but the Green Sahara is something at a totally different scale. It is the arrival of the monsoon to a desert. It stops being a desert.

  3. Steve

    I welcome more warmth in my neck of the woods.I don’t function well when it is cold.

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  5. tom0mason

    “Scientists Have Determined A 5°C Warmer Earth ‘Would Provide More Habitable Conditions’ “

    Yes I agree, that would be so nice, not likely but would be nice.
    Indeed getting a 1°C rise look to be struggling at the moment. Still it gave all the AGW types something to worry about.

  6. Petit_Barde

    Stefan Kröpelin, “Die Grüne Vergangenheit der Sahara” :

    https://www.youtube.com/watch?v=JcsSHPjdsOo

  7. Joe Chang

    the key matter is not the average temperature of earth, averaged over location and time of year, but rather the distribution of heat. If ocean currents carried more heat to the polar regions, that better for the world because the equatorial regions don’t particularly need it to be super hot, and the upper latitudes could benefit. The other key is rain fall. the tropic-sub tropic boundary is dry,

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