Positive feedback- and not in a good way...

https://www.washingtonpost.com/news/energy-environment/wp/2016/07/11/the-worlds-clouds-are-in-different-places-than-they-were-30-years-ago/

Here’s how the paper summarizes the changes, region by region: “cloud amount and albedo [i.e., reflectivity] increased over the northwest Indian Ocean, the northwest and southwest tropical Pacific Ocean, and north of the Equator in the Pacific and Atlantic oceans. Cloud amount and albedo decreased over mid-latitude oceans in both hemispheres (especially over the North Atlantic), over the southeast Indian Ocean, and in a northwest-to-southeast line stretching across the central tropical South Pacific.”

Note that it is not like some parts of the world don’t have any clouds any more. Still, the changes are significant in the context of how radiation originating from the sun enters, and ultimately departs from, the Earth’s system.

Not just one but both of these changes to clouds are “positive feedbacks” to climate change — tending to make warming worse.

Moving cloud tracks toward the poles enhances warming because at higher latitudes, less solar radiation strikes the Earth — so white clouds are reflecting less of it away from the planet than they would if they were closer to the tropics and the Equator, Norris said. Meanwhile, he continued, higher cloud tops in effect thicken the total column of cloud, and that means more trapping of infrared or heat radiation that would otherwise exit to space.

“We now have a thicker blanket, which is also a warming effect,” Norris said.