> For the complete documentation index, see [llms.txt](https://docs.carboncentral.app/knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.carboncentral.app/knowledge-base/demos/guarantee-of-origin.md).

# Guarantee of Origin

Create Guarantee of Origin certifications aligned with leading standards and methodologies including RECs, GOs, LGCs, STCs.

**Green Fuels**

Use Carbon Central to track the provenance of green fuels including hydrogen, ammonia, sustainable aviation fuel, and e-methanol for use across transportation industries.

[View our Green Hydrogen use case here](/knowledge-base/demos/guarantee-of-origin/green-hydrogen.md).

**Green Resources**

Use Carbon Central to prove the provenance of green resources such as iron ore, pig iron, steel, aluminium, and other raw minerals

**ISCC Mass Balance and Sustainability Declaration.**

Use Carbon Central to track food, feed, chemicals, plastics, packaging, textiles and renewable feedstock derived from a process using renewable energy sources
. Create Sustainability Declaration (guarantee origin) certificates aligning to the ISCC Plus System. 

[View our Mass Balance use case here](/knowledge-base/demos/guarantee-of-origin/iscc-mass-balance.md).