[HN Gopher] Coal-burning in Siberia led to climate change 250M y...
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       Coal-burning in Siberia led to climate change 250M years ago (2020)
        
       Author : zeristor
       Score  : 18 points
       Date   : 2021-07-12 20:10 UTC (2 hours ago)
        
 (HTM) web link (www.eurekalert.org)
 (TXT) w3m dump (www.eurekalert.org)
        
       | zeristor wrote:
       | Just looking at the latest video of the Icelandic eruption made
       | me think what would happen if a volcano erupted through a seam of
       | coal.
       | 
       | It seems this happened 250 million years ago.
        
       | uncoder0 wrote:
       | So they're theorizing that this event is what caused the >1500ppm
       | C02 spike ~250m years ago. Currently we're at ~400ppm. Seems like
       | we shouldn't push it too much further because nature could always
       | throw one of these events at us.
       | 
       | If I'm reading the graphs correctly the atmospheric CO2 was
       | approximately at the same level we are today.
       | 
       | Not my area of expertise so interested to see other's takes on
       | this.
        
         | loopz wrote:
         | Humans are nowhere near even slowing down CO2 emissions. CO2
         | emissions are instead accelerating further [1].
         | 
         | Carbon Dioxide Levels Lower Than Thought During Super
         | Greenhouse Period [2].
         | 
         | Do high levels of CO2 in the past contradict the warming effect
         | of CO2 [3]? There are also other drivers for climate besides
         | CO2.
         | 
         | Life on earth have enjoyed unparallelled stability for past 10K
         | years [4], so have no historical frame of reference for what
         | happens if temperature breaks free from this zone.
         | 
         | Extinction events on earth for past 300 million years are
         | associated with CO2 concentrations above 900 ppm [5], page 8.
         | 
         | [1] https://gml.noaa.gov/ccgg/trends/gl_gr.html
         | 
         | [2] https://www.dartmouth.edu/press-releases/carbon-dioxide-
         | leve...
         | 
         | [3] https://skepticalscience.com/co2-higher-in-past-
         | intermediate...
         | 
         | [4] https://earth.org/data_visualization/a-brief-history-of-
         | co2/
         | 
         | [5]
         | http://burro.case.edu/Academics/USNA229/impactfromthedeep.pd...
         | 
         | Where this gets complicated is wether earth is due another ice
         | age or not as well.
        
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       (page generated 2021-07-12 23:02 UTC)