GCAM 8.2

A major release coinciding with the 2025 GCAM Annual Meeting. This includes the culmination of intermediate releases of GCAM v7.2-8.1 which consists of the following developments. For details see the updates page on our documentation site.

1. 399: Updating the SSP Database (v3.0) including Population, GDP, and Labor Force
2. 394 Updated approach for intermittent electricity integration
3. 390: Base Year Update: Initial updates preparing for the new base year
4. 404: Base Year Update: Move Model Base Year to 2021
5. 401: Ukraine as an independent region
6. 403:Miscellaneous Bugfixes Prior to 2025 Annual Meeting

GCAM 8.1

Intermediate release of Core Model Proposals:

• 401: Ukraine as an independent region

GCAM 8.0

Intermediate release of Core Model Proposals:

• 404: Base Year Update: Move Model Base Year to 2021

GCAM 7.4

Intermediate release of Core Model Proposals:

• 390: Base Year Update: Initial updates preparing for the new base year

GCAM 7.3

Intermediate release of Core Model Proposals:

• 394 Updated approach for intermittent electricity integration

GCAM 7.2

Intermediate release of Core Model Proposals:

• 399: Updating the SSP Database (v3.0) including Population, GDP, and Labor Force

GCAM 7.1

New features include the following. For details see the updates page on our documentation site.

1. Forestry details: Hardwood/Softwood and product pools for Pulp and Sawnwood
2. Hydrogen Update
3. Ammonia Trade
4. Biomass Oil Sharing Bugfix
5. Pulp and Paper Detailed Industry
6. AgLU Paramater Updates
7. Food Processing Detailed Industry
8. Residential Floorspace and Energy Demands by Income Decline
9. Agriculture and Food Storage
10. Hector v3.2.0
11. Final Bugfix before GCAM 7.1

GCAM 7.0

New features include the following. For details see the updates page on our documentation site.

1. Fix Extrapolation in Residue Biomass
2. Add Land Use History Output
3. Miscellaneous Bug Fixes Part 1
4. Add Exogenous Shutdown Decider
5. Miscellaneous Bug Fixes Part 2
6. GCAM v6.0 transportation bugfix
7. Adding fugitive CO2 emissions from fossil resources
8. AgLU data and method updates (connecting land hectares to food calories)
9. GCAM-USA nonCO2 GHG emissions in industrial and urban processes
10. Detailed Natural Gas Trade
11. [Natural Gas Final Grade Cost and Miscellaneous Solution Improvements
12. Global Iron and Steel Trade
13. GCAM Macro-Economic Module (KLEM Version)
14. gcamdata chunk re-name
15. Update to Hector v3
16. Bugfix before 7.0 Release

GCAM 6.0

New features include:

1. A new residential floorspace expansion model.
2. Bio-energy updates: additional limits to "unsustainable" deployment
3. Default hotelling rate for climate stabilization scenarios is now 3%.
4. Split out 6 detailed industrial sectors from the aggregate industry sector.
5. Updated Hydrogen production, distribution, and end-use technologies.
6. A new protected lands definition.
7. Expanded crop commodities.
8. Use spatially explicit soil and vegetation carbon data from Moirai.
9. HFC MAC curve fixes.
10. New pollutant emissions controls.
11. Add direct air capture as a mitigation option in GCAM-USA.
12. Gross electricity trade in GCAM-USA.
13. Add GHGs to GCAM-USA.
14. Add pollutant emissions to GCAM-USA.
15. Solution improvements, particularly related to water markets.
16. Change the XML parser library to RapidXML.
17. Add the ability to exit the model early due to solution failure.
18. Reduce memory usage (offsets additional memory from expanded crop commodities).
19. gcamdata: Renv and user modification chunks.

GCAM 5.4

New features include:

1. Updated technology costs for electricity and transportation technologies
2. Emissions: using CEDS as data source, updated to 2015, new MAC curves
3. Trade: improved trade for fossil fuels, forestry, and agriculture
4. Included water markets in GCAM-USA
5. Energy for water
6. New food demand representation
7. Solver improvements and library changes
8. gcamdata updated to use drake and work with dplyr 1.0.0
9. Removed unused code
10. Minor updates and bugfixes
11. Optional features (not turned on by default):
    - Direct Air Capture
    - Ability to specify exogenous floorspace pathways
    - Ability to scale CH₄ and N₂O emissions to EPA inventories