Non-human Geo-engineers

Bringing back the wooly mammoth isn't really science fiction any more. I have been predicting for some time that V. Putin will somehow be involved in cloning or engineering mammoths before his run is up. Russian conservationists suggest repopulating the north of Siberia and Alaska will help halt permafrost melting. It's plausible....

https://www.amazon.com/Woolly-Revive-Historys-Extinct-Creatures/dp/1501135554/ref=sr_1_1