| Slimebeast said: Ok, I understand. But still, when landmass was concentrated near the equator (the Pangea continent), wasn't that like +100 million of years ago? And I recall that I have seen numbers of past CO2 thrown around of at least 500ppm if not more. But perhaps those really high CO2 concentrations were pre-cambrian and after that it's been more or less stable in the 2-300ppm ballpark during almost 500 million years. Is that the current theory? Which would mean that our current 390ppm is a level we haven't seen in hundreds of millions of year. Is that the current theory, or have we had 500ppm levels after the cambrian, during interglacial periods or whatever? I'm just curious. |
It's likely that we had really high CO2 conc levels from end of perm to the end of the jurassic periode with 500-1000ppm(maybe even more) and up to the start of the neogene periode 22million years ago it still was about 300-400ppm - after that it dropped to the 250-280ppm and was pretty constant at that level until the 20th century.
The climate change I was refering took place ~280million years ago close to the start of the perm periode, temperatures went up significantly without much of a CO2 increase/at very low CO2 levels and yes that was after pangea was formed (pangea formed ~300m years ago and broke apart ~200m years ago)
