Hence, carbon -
cycle feedbacks linked to biological activity appear to have played at least some role in the climate variations of the past thousand years.
Not exact matches
I think it is likely that the dominant difference is the carbon
cycle feedback in a rapidly warming world which was not included in the IPCC figure you
linked.
Polar amplication is of global concern due to the potential effects of future warming on ice sheet stability and, therefore, global sea level (see Sections 5.6.1, 5.8.1 and Chapter 13) and carbon
cycle feedbacks such as those
linked with permafrost melting (see Chapter 6)... The magnitude of polar amplification depends on the relative strength and duration of different climate
feedbacks, which determine the transient and equilibrium response to external forcings.
This paper is nonetheless interesting for the
link that they make to the carbon
cycle and the potential for
feedbacks that may amplify the CO2 concentration in the future that will depend on the warming, and hence on climate sensitivity.
Abstract The major biogeochemical
cycles which keep the present - day Earth habitable are
linked by a network of
feedbacks which has led to a broadly stable chemical composition of the oceans and atmosphere...