That's not really a theory (southern warming -> release co2 -> increase northern warming), that is well-established physical and biological processes.
Why should there be a similar 800-year lag today? The past CO2 increases were due to natural processes whereby as the temperature increased more biological activity was occurring and thus emitting more CO2. The historical lag makes complete sense from that perspective.
Currently, were artificially adding sequestered CO2 (which is known to trap heat) to the atmosphere and the temperature is increasing, with a fairly strong correlation, as a result.
https://www.scientificamerican.com/article/no-pause-in-ocean...
That's not really a theory (southern warming -> release co2 -> increase northern warming), that is well-established physical and biological processes.
Why should there be a similar 800-year lag today? The past CO2 increases were due to natural processes whereby as the temperature increased more biological activity was occurring and thus emitting more CO2. The historical lag makes complete sense from that perspective.
Currently, were artificially adding sequestered CO2 (which is known to trap heat) to the atmosphere and the temperature is increasing, with a fairly strong correlation, as a result.
here's some further reading for you: http://www.ipcc.ch/report/ar5/wg1/