Human breastmilk has a fairly constant composition, and is only selectively affected by the diet of the mother. (lllc.ca)
Many of the «committed warming» scenarios are actually for constant composition: so rather than emissions dropping to zero, emissions stay at a low level to maintain the current CO2 concentrations. (climatesight.org)
There is a wide spread among the models for the thermal expansion commitment at constant composition due partly to climate sensitivity, and partly to differences in the parametrization of vertical mixing affecting ocean heat uptake (e.g., Weaver and Wiebe, 1999). (ipcc.ch)