• ThenThreeMore@startrek.website
    link
    fedilink
    English
    arrow-up
    9
    ·
    1 year ago

    Speed of change.

    Natural climate changes happen over tens of thousands to hundreds of thousands of years

    Not tens to hundreds of years.

    • GreenM@lemmy.world
      link
      fedilink
      arrow-up
      2
      arrow-down
      1
      ·
      edit-2
      1 year ago

      Not always, check Sahara for instance. Went from grass lands with biggest lake on planet to dust dry place within hundreds of years as Egyptians who built pyramids still lived in period before total desrtification. That affected whole world climate BTW.

        • GreenM@lemmy.world
          link
          fedilink
          arrow-up
          1
          arrow-down
          1
          ·
          1 year ago

          Not in Sahara case. Or to be precise it’s cycle of combinations of titling earth axe, changing orbit shape and maybe some other things like solar cycles that all affects global climate all over the planet manifesting among else in Sahara as cycles of desert <> grassland depending on which phase it is ATM.
          That solar cycle itself change global avg temperature every few years.
          Also around middle age there was “small” ice age. You see, climate seem stable but it isn’t even in horizont of hundreds of years. It will change regardless of humans. Point is whether humans help it into good/ neutral / bad phase and how long it takes.

          My other point is that eachtime earth was warmer few degrees than today, life boomed.

          • HikingVet@lemmy.sdf.org
            link
            fedilink
            arrow-up
            1
            ·
            1 year ago

            It’s on a 40000+ year cycle, it’s not expected to be naturally green for another 15000 years. And some of the people who study this say that it is dry for the majority of the time (idk the actual breakdown that they claim but it is not a measly 1-2%).

            So yes, a green Sahara is unusual.

            • GreenM@lemmy.world
              link
              fedilink
              arrow-up
              1
              arrow-down
              1
              ·
              edit-2
              1 year ago

              My point is It’s irrelevant whether you think of it as such, OP point is climate changed in that time relatively fast dispite humans not going through industrial revolution. It manifested among else in Sahara.

              • HikingVet@lemmy.sdf.org
                link
                fedilink
                arrow-up
                1
                ·
                1 year ago

                Are you trying to say manmade climate change isn’t as bad for us as its being made out to be?

                Because if you are, the planet literally doesn’t care and if some of the more basic lifeforms survive, life will go on.

                But what we are worried about is whether it is habitable for humans, and we are fucking over our ability to survive at several magnitudes faster than is normal for our little rock spaceship.

                • GreenM@lemmy.world
                  link
                  fedilink
                  arrow-up
                  1
                  ·
                  edit-2
                  1 year ago

                  I’m saying there are tens of theories, some of them are bad others are good or neutral for humans or other species. I’m also hinting that often activists and goverments don’t follow reason or science but are after feelings and sensations. But we should let scientists tp figure it out and find concensus.