CarbonTiers · User guide
National Reporting Suite User Guide
National Reporting Suite
2006 IPCC Guidelines · UNFCCC CRT (Decision 5/CMA.3) · Paris Agreement Enhanced Transparency Framework (BTR)
This guide explains how to run all five IPCC sectors in one workspace and take the national inventory through to UNFCCC reporting: shared year, GWP and file handling, the embedded sector tools, scenarios, national results and key category analysis, the cross-sector audit and the CRT / BTR summary tables. Table titles and thresholds are generated from the tool’s own records.
- 10
- workspace views
- 5
- IPCC sectors in one file
- 9
- CRT tables
- 95
- key category threshold (%)
- Version
- 1.0
- Last reviewed
- 20 October 2026
- Current edition
- carbontiers.com/calculator/national-reporting/guide
This guide is updated with the tool. Counts and factor tables are generated from the registries the tool calculates with. The latest edition is always at the address above.
1About the tool
The National Reporting Suite brings the Energy, IPPU, Agriculture, LULUCF and Waste tools together under one reporting year, one GWP set and one workbook file, and derives the national total, the key category analysis, the cross-sector consistency audit and the UNFCCC CRT / BTR summary tables from that shared data. It is built for national inventory teams, ministries and agencies, and consultants working at national scale.
| Group | View | Content |
|---|---|---|
| Set-up | Overview | Inventory name, country/scale, active year, GWP, file |
| Sectors | Energy | Energy tool, embedded |
| Sectors | IPPU | IPPU tool, embedded |
| Sectors | Agriculture | Agriculture tool, embedded |
| Sectors | LULUCF | LULUCF tool, embedded |
| Sectors | Waste | Waste tool, embedded |
| National level | Scenarios | Inventory-total projection, cross-sector scenario |
| National level | National Results | National total, key category analysis, report |
| National level | Cross-Sector Audit | Cross-sector QA/QC checks |
| National level | CRT / BTR Report | UNFCCC CRT summary tables, Table 10, Excel, XML |
2Quick start
- 1
Create or open a file
The suite starts by asking you to create a workbook or open a saved one. The file holds all five sectors in one place (.ghgallsectors).
- 2
Complete the Overview
Inventory name, country and scale, active year and GWP set.
- 3
Calculate the sectors
The sector tabs in the top bar open the sector tools; each sector is covered in its own guide.
- 4
Review national results
National Results shows the national total and the key categories; the live total in the top bar tracks the same figure.
- 5
Audit
The Cross-Sector Audit flags double-counting and missing-entry risks between sectors.
- 6
Report
The CRT / BTR Report shows the summary and trend tables on screen and exports them to Excel and XML.
4Embedded sector tools
The sector tabs open the same sector tools that are offered on their own; calculation methods, tiers and factor tables are identical. Each sector is described in detail in its own guide.
| Sector | Guide |
|---|---|
| Energy | /calculator/energy/guide |
| IPPU | /calculator/ippu/guide |
| Agriculture | /calculator/agriculture/guide |
| LULUCF | /calculator/lulucf/guide |
| Waste | /calculator/waste/guide |
5Scenarios
- Inventory total: business-as-usual and mitigation projection from your own inventory; all sub-sectors and all gases (CO₂e).
- Cross-sector scenario: built by selecting one run scenario from each of at least two sectors.
- Least-cost pathway: an economy-wide optimisation (OSeMOSYS) compared with a no-policy reference. It appears when pathway data exists for the inventory country; otherwise the view shows the inventory total only, with no empty panel.
6National results and key category analysis
- The five-sector total and sector totals by year.
- Key category analysis (2006 IPCC Vol. 1 Ch. 4, Approach 1): level and trend assessment. Categories ranked from largest to smallest whose cumulative share reaches 95% are key; those in the 95–97% band are not key but are flagged for qualitative review.
- Key categories are the candidates for higher-tier methods, country-specific factors and priority QA/QC.
- Report: PDF with cover, inventory identity and boundary, GWP footnote, CRF summary and category breakdown of all five sectors; Excel with an inventory information sheet and the tables.
7Cross-sector audit
The Cross-Sector Audit checks four relationships: Energy vs IPPU, Energy vs Waste (WtE), Agriculture vs LULUCF, Energy vs Agriculture. Each check is one of three kinds:
- True reconciliation: whether the LULUCF biomass and soil sheets use the same converted area.
- Presence and scale warning: an item reported in one sector that looks zero or missing in the related sector (e.g. coke-oven gas, ammonia feedstock, waste incineration with energy recovery).
- No data: where the sub-category data the check needs is not kept on any sheet, the case is flagged openly instead of silently counting as passed.
8CRT / BTR report
The Common Reporting Tables (CRT) summaries submitted with the Biennial Transparency Report (BTR) under the Paris Agreement Enhanced Transparency Framework are built directly from the multi-year, gas-by-gas data of the five sectors. The cell you see on screen and the cell written to the file come from the same report object.
| Table |
|---|
| Summary 1.A — Summary Report for National Greenhouse Gas Inventories |
| Summary 2 — Summary Report for CO₂ Equivalent Emissions |
| Summary 3 — Sectoral Totals and Shares |
| Table 10 s1 — CO₂ Emission Trends |
| Table 10 s2 — CH₄ Emission Trends |
| Table 10 s3 — N₂O Emission Trends |
| Table 10 s4 — F-gas Emission Trends |
| Table 10 s5 — Total CO₂ Equivalent Emission Trends |
| Table 10 s6 — Change Relative to Base Year |
- The summary row tree covers 43 CRT categories (Energy, IPPU, Agriculture, LULUCF, Waste, Other).
- Cell-level validation: delivered as a separate Validation sheet in Excel. If any finding is at error level, no XML is produced, so an incorrect submission is never created silently.
- Excel: cover, summary tables, Table 10 sheets, validation and a notation-key glossary.
- XML: a lossless mirror of the CRT table structure (table, column, row, cell, notation keys). The official XML schema of the UNFCCC ETF reporting tool is not public, so the file uses its own namespace (urn:carbontrack:crt:1); direct upload to the official portal is not guaranteed.
9Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| The suite asks for a file | No active workbook | Create a file or open a saved one |
| Cross-sector scenario unavailable | Fewer than two sectors have a run scenario | Run one scenario in each of two sectors |
| No least-cost pathway tab | No pathway data for the inventory country | Expected behaviour; use the inventory-total projection |
| XML does not download | Validation has error-level findings | Fix the errors listed on the Excel Validation sheet |
| Audit says “no data” | The sub-category data is not kept | Expected behaviour; check manually |
10Glossary
| Term | Meaning |
|---|---|
| CRT | Common Reporting Tables (UNFCCC, Decision 5/CMA.3) |
| BTR | Biennial Transparency Report |
| ETF | Enhanced Transparency Framework (Paris Agreement Art. 13) |
| Key category | A category that drives the level or trend of the total |
| BAU | Business-as-usual (no new policy) scenario |
| QA/QC | Quality assurance and quality control |
11References
- 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Vol. 1 Ch. 4 (key categories).
- Decisions 18/CMA.1 and 5/CMA.3 — modalities, procedures and guidelines of the transparency framework; Common Reporting Tables.
- UNFCCC ETF reporting tool documentation.
Revision history
| 20 October 2026 | First edition. |