As temperature increases due to global warming, the release of methane from wetlands increases. This is an example of which of the following?

Warming releasing more wetland methane, which then warms further, is a positive feedback that amplifies the change.

It is not a negative feedback, which would damp warming rather than boost it.

It is not a mix of positive and negative, as the effect here only reinforces warming.

It is not an absence of feedback, since one change clearly feeds back on itself.

Methane is a strong greenhouse gas, so more of it traps more heat and drives more release.

Melting permafrost releasing trapped methane is another well-known positive feedback.