Editing Biogeochemical Feedbacks (section)

== The Cloud Radiative Feedback ==

Clouds represent the most complex and heavily studied feedback mechanism in climate science, as they possess a dual nature: they can both cool and warm the Earth depending on their physical properties and altitude.

* '''Low, Thick Clouds (Cooling):''' Stratocumulus clouds, which hang low in the troposphere, are highly reflective. They bounce incoming shortwave solar radiation back into space (a negative, stabilizing feedback).
* '''High, Thin Clouds (Warming):''' Cirrus clouds, which form high in the troposphere, are largely transparent to incoming shortwave radiation but are highly effective at trapping outgoing longwave thermal radiation (a positive, amplifying feedback).

The net global feedback of clouds depends on how warming alters their distribution, altitude, and optical properties. Current observational data and advanced modeling indicate that the net cloud feedback is likely positive. As the troposphere warms and the tropopause expands upward, high clouds shift to even higher, colder altitudes, making them less efficient at radiating heat to space, thereby trapping more energy within the climate system.