1. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP Volume I General Guidance and Reporting Bonn, 18 may 2006 Newton Paciornik Ministry of Science and Technology of Brazil

2. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 2 General Guidance Development  Built on GPG 2000 and GPG LULUCF Quantifying uncertainties in practice Methodological choice (key sources) Recalculation Quality Control / Quality Assurance  2006 Guidelines Introductory section on GHG inventories and steps needed for preparation Extended advice on data collection

3. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 3 Inventory Quality – Good Practice  Transparency sufficient and clear documentation possible replication  Completeness all categories of sources and sinks all gases geographical coverage missing elements clearly documented and justified

4. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 4 Inventory Quality – Good Practice  Consistency differences between different years estimations should reflect real changes careful treatment of methodological changes  Comparability (among countries) classification and definition of categories of emissions and removals use of reporting guidance and tables

5. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 5 Inventory Quality – Good Practice  Accuracy emissions and removals are neither over- nor underestimates so far as can be judged and in which uncertainties are reduced as far as practicable

6. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 6 Estimation Methods – Basic concepts  Tiers Methods are presented in 3 tiers  Tier 1 – Basic method using available national and international statistics and default emission factors  Tier 2 – Intermediate method using country specific data  Tier 3 – Higher complexity methods with more demanding data requirements and generally more accurate

7. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 7 Estimation methods – Basic concepts  Key categories approach used to identify categories that have a significant influence on a country’s GHG inventory in terms of level, trend or uncertainty of emissions and removals  Decision trees help in selection of appropriate tiered methodology based on assessment of key categories

8. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 8 Compiling an Inventory General Guidance  Data collection Data collection planning Using existing data Generating new data Emission factors and direct measurements Activity data Expert elicitation and surveys

9. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 9 Compiling an Inventory General Guidance  Uncertainty assessment Conceptual basis Causes of uncertainty Reducing uncertainty Quantifying uncertainties Combining uncertainties

10. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 10 Compiling an Inventory General Guidance  Key category analysis Basis for methodological choice and prioritizing resources General approach (level and trend)  Guidance on disaggregation level Approach 1 (level contribution) Approach 2 (level +uncertainty) Qualitative criteria

11. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 11 Compiling an Inventory General Guidance  Time series consistency Methods for ensuring time-series consistency in cases where it is not possible to use the same method/data for the entire period Guidance in recalculation of estimates for previous years Resolving data gaps

12. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 12 Compiling an Inventory General Guidance  Quality assurance/Quality control Developing a QA/QC plan QC procedures  assess and maintain quality during inventory compilation QA procedures  review procedures by external personnel Verification procedures  external methods and data

13. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 13 Compiling an Inventory General Guidance  Precursors and indirect N 2 O Cross-sectoral guidance Link to EMEP/Corinair Indirect N 2 O from atmospheric deposition of NO x and NH 3

14. INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE NATIONAL GREENHOUSE GAS INVENTORIES PROGRAMME WMO UNEP 14 Compiling an Inventory General Guidance  Reporting Coverage – category definition Notation keys Units Reporting tables  Annual inventory  Trend tables by gas  Uncertainties and key categories tables