There’s a section of the Trans-Alaska Pipeline north of Fairbanks that is threatened by thawing permafrost, and steps are being taken to prevent or mitigate damage. Jack says the work is not visible from the Dalton. We’ll provide photos in the future if they become available, but for now here are some of the thermosyphons that are used to keep the permafrost cold under the pipeline, photos taken by us several years ago at about 26 Mile Dalton.

The below image is from Inside Climate News, Arthur Chapman via Flickr Creative Commons.