Skip to comments.How Did Earth Avoid Runaway Global Warming In The Past?
Posted on 06/11/2014 3:15:09 PM PDT by Up Yours Marxists
There have been times in our geological history when CO2 levels were 10X what they are today, yet warming was only slightly higher.
Unlike what you often read in simplistic media accounts, there are a lot of variables in climate and weather and temperature. It takes a lot of things going wrong to turn Earth into Venus and we have never come close.
At the Goldschmidt geochemistry conference in Sacramento, geochemists discussed one such period, but they say we just got lucky - a vast mountain range formed in the middle of the ancient supercontinent, Pangea.
Around 300 million years ago, plate tectonics caused the continents to aggregate into a giant supercontinent. The sheer size of the continent meant that much of the land surface was far from the sea, and so the continent became increasingly arid due to lack of humidity. This aridity meant that rock weathering was reduced; normally, a reduction in rock weathering means that CO2 levels rise, yet in spite of this CO2 levels which had been falling prior to the mountain formation- continued to drop, eventually undergoing the most significant drop in atmospheric CO2 of the last 500 million years. This phenomenon has remained unexplained - and still is, but a group of French scientists from the CNRS in Toulouse have come up with a conjecture based on a model which seeks to explain this contradiction.
(Excerpt) Read more at science20.com ...
Looking forward to additional info from this level-headed site.
Easy, there wern’t any liberals to make up lies about it.
Chicken little scenarios only seem to occur when Democrats are elected, or at least allowed to speak in public. Solution: remove vocal cords and voting rights from all Democrats and all crises will be averted.
Oooga booga. Noooga mooga nooga taxoooga.
Boy, bookmarking this one!
I have a couple of coworkers who are way convinced about all this AGW silliness. One has friends in Florida who swear they are losing their front yard to the rising ocean. The other made a deal with me that if I would watch a recent episode of Cosmos with that Tyson dude, he’d listen to an hour of Rush.
I watched the show, nothing but pretty CGI stuff as far as I can tell. And 10-year-old suppositions about CO2 levels and heating and other crap. My bud just happened to listen to Limbaugh today when El Rushbo was on a tear about the Cantor race in VA. Where my bud lives! He weren’t too happy about that “Tea Bagger taking over Cantor’s seat” so I just had to laugh.
Kind of wonder what caused the last ice age and then what ended it.
Dinosaurs didn’t fart as much as cows of today fart.
Al Gore wasn’t born yet!
I love that Looney Tunes short. I was a senior in High School when that one came out. Was shown before “Sunset Boulevard” down at the ole dime showing in the downtown WB Theater in Denver.
Those were great times.
>>I love that Looney Tunes short. <<
It is on the banned list like so many great WB cartoons.
Typical communist clap crap. Ban our heritage.
I love Inky. Free Inky. Brother, could you spare a hair bone?
1) Heat trapping gasses increase...
2) Earth warms
3) Ocean evaporation increases
4) Precipitation increase cooling Earth and bringing arid desert back into bloom
5) Foliage growth increases consuming more CO2
6) Earth cools
7) Rinse and repeat, as neccessary..
“they say we just got lucky” Well, I don’t believe in luck and God has His hand in every square inch of this planet He created just for us.
I do not understand how rock weathering reduces CO2 but if rock turns to dirt (by the way, the Appalachians are awesome and love the angle of the layers seen from highway construction) then the plants would grow and use up the CO2?
The article fits very well with the likelihood that the rise of the Himalayas together with the Monsoon rain patterns resulted a big carbon sink. The all time low CO2 levels may have been one of a number of factors leading to the ice ages.
Great screenname! LOL!
The article appears to be deeply flawed by disregarding the role of the positioning of the supercontinent astride the tropical belt at the the same time the shallow Tethys Sea promoted increased plant growth, the Devonian and Carboniferous forests developed and dramatically increased the atmospheric concentrations of Oxygen by equally dramatic depletion Carbon dioxide, the increased Oxygen concentrations lowered atmospheric temperatures, and the lowered atmospheric temperatures removed Carbon dioxide from the atmosphere and kept it dissolved in the hydrosphere. Similar cycles can be seen every time the Earth’s temperatures have become cold the atmospheric concentrations of Carbon dioxide have dramatically declined.
A little mix of God deriving the function that we discovered as mathematics. The rest is physics.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.