Geotherapy rather than geoengineering, please. Geotherapy is the idea of using existing ecological systems to repair the damage anthropogenic activity, like climate change, has caused. It, unlike geoengineering, is a systems solutions for a systems problem.
Geotherapy: Innovative Methods of Soil Fertility Restoration, Carbon Sequestration, and Reversing CO2 Increase (https://www.crcpress.com/Geotherapy-Innovative-Methods-of-Soil-Fertility-Restoration-Carbon-Sequestration/Goreau-Larson-Campe/p/book/9781466595392) is the one academic text I know of which covers at least part of this subject.
The video proceedings of the conferences Biodiversity for a Livable Climate (http://bio4climate.org) has organized are another great resource on this topic as is the continuing work of Soil 4 Climate (http://soil4climate.org).
As a layperson who has been monitoring climate science at Harvard and MIT since the late 1970s, I can tell you that the concept of geotherapy never comes up unless I raise it. I have even attended some of the solar geoengineering seminars David Keith and others have presented at these two institutions and don’t believe that these extremely smart people have a lick of wisdom. They come across to me as engineers excited to have a hammer seeing everything around them as a nail to bang home.