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Thread: Carbon Dioxide Levels Reach 400 ppm: Not Seen in Three Million Years

  1. #11
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    Quote Originally Posted by Sampan View Post
    The obvious question(s)
    Sans naughty humans, what was the cause of 400ppm 3 million years ago?
    If much higher concentrations occurred naturally in the past, why discount natural increase for rises seen today.
    Was the Earth uninhabitable 3 million years ago and were there not Ice Ages happening on a regular basis at this time?
    Compared to the last 500 million years of Earth history, are our current Co2 levels, excessively high, average or uniquely low?
    It's obvious that euthycarcinoids, fish, insects and plants were able to thrive in whatever atmosphere was around 500-400 million years ago.
    Nearer our time, 65 million years ago, a giant meteor wiped out giant reptiles and allowed mammals to dominate. Fifty-five million years ago, a sudden rise in greenhouse gases sent temperatures soaring and transformed the planet, wiping out many other species in the depths of the sea — though those in shallow seas and on land were spared.
    Six million years ago, humans diverged from bonobos and chimps, and soon began to walk on two legs.
    So perhaps humans owe their existence to giant chills and global warming. And the next episode(s) could see them evolve further...
    The poster reserves the right to amend or completely change any opinions he has posted at any time...

  2. #12
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    It's even higher in a car. I can't find the link now, but it had a graph of ppm vs time. 4 people get in a car and 30min later the CO2 is 4000ppm!

    It's not been seen in 3 million years because CO2 is a colourless gas and without a CO2 meter you're bugged.
    Who cares where you were wot night
    Now we have you under this light

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  4. #13
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    Quote Originally Posted by Patman Post View Post
    It's obvious that euthycarcinoids, fish, insects and plants were able to thrive in whatever atmosphere was around 500-400 million years ago.

    ...
    Well yes and no. Certain plant, insects etc could thrive, but not all the time. The oxygen content of the atmosphere varied between 35% down to 15%, which meant that at the top end you had insects with 28 inch (or 70cm in new money) wingspans and a few tiny bugs gasping for breath at the bottom. If the oxygen content was going up and down like a working girl's underwear then it is safe to assume that carbon dioxide levels also varied, even before Emma Thompson started jetting around the world to save it.

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    Quote Originally Posted by Sampan View Post
    The obvious question(s)
    Sans naughty humans, what was the cause of 400ppm 3 million years ago?
    If much higher concentrations occurred naturally in the past, why discount natural increase for rises seen today.
    Was the Earth uninhabitable 3 million years ago and were there not Ice Ages happening on a regular basis at this time?
    Compared to the last 500 million years of Earth history, are our current Co2 levels, excessively high, average or uniquely low?
    And this is of course the killer question. As I understand it, there's rather a lot of the stuff "fixed" in carboniferous limestone
    --
    "The Inland Revenue is not slow, and quite rightly, to take every advantage which is open to it under the Taxing Statutes for the purposes of depleting the taxpayer's pocket. And the taxpayer is in like manner entitled to be astute to prevent, so far as he honestly can, the depletion of his means by the Inland Revenue"

    Lord Clyde: "Ayrshire Pullman Motor Services V Inland Revenue, 1929"

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    CO2 does not drive climate temperature change, CO2 is a product of temperature change

    If CO2 in the atmosphere was the cause of temperature rise then the effect would be seen most in the upper atmosphere, this is not the case.

    As for CO2 being the most important greenhouse gas, lol. CO2 makes up less than 4% of green house gasses, it is about number 5.
    I can explain it to you, but I canít understand it for you.

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