Mast Reforestation has completed what it describes as the world’s largest single biomass storage project, burying more than 10 million pounds of fire-killed trees in south-central Montana in the US.
The project – known as Mast Wood Preserve MT1 – combines post-wildfire reforestation with engineered biomass burial, marking a significant development in carbon dioxide removal (CDR) technology.
Work on the MT1 site began just four months ago. The buried logs, which would otherwise have been burned on site, are now sealed within a purpose-built chamber designed to prevent decomposition and emissions for at least a century.
Continuous monitoring shows no greenhouse gases escaping, and the project has secured an independent endowment to fund long-term verification.
By the first quarter of 2026, Mast expects the project to generate up to 5,000 tonnes of carbon removal credits, registered through Puro.earth and rated ‘Apre’ by BeZero Carbon.
Biomass burial, also referred to as Terrestrial Storage of Biomass (TSB), is considered one of the most efficient biomass-based CDR pathways.
Mast claims the process can sequester twice as much carbon as biochar production from the same feedstock.
MT1 credits will also finance reforestation on the surrounding land, which supports biodiversity, cultural heritage and silvopasture.
Seedlings sourced from local wild seed are already being raised in Mast’s commercial nurseries for planting in spring 2026.
Chief executive Grant Canary said the initiative provides a 'durable, scalable' model for carbon removal that supports ecological recovery and local livelihoods.
Mast estimates that more than 2.8 million tonnes of fire-killed trees are available for similar treatment across Montana’s recently burned landscapes.
Credits from the MT1 project are already available for pre-sale through CEEZER and Cloverly.
Mast Reforestation completes major biomass burial project in Montana
