So either the underlying models are biased in that they can not generate net negative feedbacks, or their results have been fitted to non-negative distributions such as the gamma. (judithcurry.com)
Because an oxygen decrease was initiated by something requiring oxygen (i.e. the activity burrowing animals) a net negative feedback loop was created. (sciencedaily.com)
The change in radiation balance is more heating of the oceans at one side (specifically high in the subtropics, as expected), but more heat released at higher altitudes, thus somewhere acting as a net negative feedback to higher sea surface temperatures. (realclimate.org)