> For the complete documentation index, see [llms.txt](https://aetlas.gitbook.io/aetlas/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://aetlas.gitbook.io/aetlas/for-project-developers/references-and-other-guidance/additional-principles-for-biomass-based-projects/carbon-accounting-and-mrv.md).

# Carbon Accounting and MRV

### Project Developers Must

* Ensure that CDR claims are consistent with a net carbon negative outcome based on a cradle-to-grave life cycle assessment (LCA), including biomass feedstock, process emissions, and product transportation. 
* For waste feedstocks, provide detailed accounting and justification of counterfactuals. 
* Implement guidance for MRV listed under Process-specific considerations (below). 

### Project Developers Should

* Conduct both attributional and consequential life cycle assessments. 
* Adjust carbon accounting to reflect trends in forest carbon stocks over time in the project feedstock sourcing woodshed where forest biomass is used. 
* Clearly outline allocation methods for co-products, including a sensitivity analysis on allocation assumptions and different scenarios employed.