Are We Going Into An Ice Age?

[Slimebeast]

Lafiel said:

Slimebeast said:

Lafiel said:

Augen said:

As a professional in the field, how much does the percentage of carbon in our atmoshpere affect such things?

In the past we had an ice house to hot house change at about 200ppm CO2 (it rose to 285ppm shortly after it got to be a hot house climate), but back then a majority of the landmasses were located near the equator.

How can that be? Those 200ppm and 280ppm ice core measurements go back tens of thousands and at max a hundred thousands of years back in time, correct?

While landmasses to significantly move is a process that takes millions of years, doesn't it?

yes, the ice cores aren't old enough (I'm pretty sure the oldest one we have goes ~800k years back and the oldest still preserved in the antarctic ice sheet might be about 1.5 million years old ), but those aren't the only way to determine past atmospheric compositions, although they are more accurate than other methods

coral/shell/brachiopod fossils and certain sediments, sedimentary facies  for example can give good clues about those aswell

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.