History (1990-Present)


GEIA has a 30-year history of expanding communications with the growing GEIA network through this virtual center (GEIAcenter.org); broadening objectives and international organization; and  growing contributions in emissions research, data development and distribution, and community building.  GEIA has evolved to provide increasingly valuable information on emission and exchange processes to research, assessment, regulation, and policy making. 

GEIA, initiated in 1990, has  these distinct periods of new growth directions.

1990-1996  Early years under Tom Graedel’s Leadership

1996-1998  Interim under Gregg Marland

1998-2003  Next phase under Jos Olivier and Derek Cunnold

2003-2010  Major growth under Claire Granier and Alex Guenther

2010-2011  Transition to new Co-chairs Greg Frost and Leonor Tarrason

2012-2021  Expansion of data access, emissions analyses, and community outreach.

2021-Present Transition to Co-chairs Cathy Leal-Liousse and Brian McDonald

Web Site, Network, Name

GEIACenter.org has been the GEIA web site, under direction of Paulette Middleton, since1991. NASA has been a sponsor of the GEIA web site since its inception.

The GEIA email network, over 2000 in 2023, is kept informed by regular email and web site communications. 

In 2011, the meaning of the GEIA name was changed from the Global Emissions Inventory Activity to the Global Emissions IniAtive to more clearly reflect the expanding role of GEIA in bridging emissions science and policy making.


1991 Original Objectives developed by original GEIA leadership:

  • To establish a framework for the development and evaluation of global emissions inventories.
  • To conduct a critical survey of existing emissions inventories of compounds of major importance in global atmospheric chemistry.
  • To generate and publish inventories for use by scientists and policy makers worldwide.

The ultimate target of the GEIA effort is to establish emissions inventories for all trace species of interest, incorporating fluxes from both anthropogenic and natural sources.

1998 Expanded Objectives Proposed at Start of Olivier/Cunnold

·   --To establish a framework for developing, updating and evaluating global emissions inventories relevant for global atmospheric assessments

·    --To generate and distribute inventories and supporting documentation and to publish inventories in the open literature, for use by scientists, the regulatory and policy communities and others world-wide

·    --To conduct a critical survey of existing emissions inventories of compounds of major importance in global atmospheric chemistry

·    --To keep the scientific community updated on work being done through periodic news bulletins and workshops

2003-2004  New Initiatives and Plans at beginning of Granier/Guenther

GEIA began assuming a broader role in the global change community, going beyond development of standard inventories to provide timely information on emissions on different spatial and temporal scales and related fluxes. 

7 new themes established:

1.     New inventories,

2.     Inter-comparisons and Evaluations,

3.     Prioritize Observations,

4.     Databases of driving variables,

5.     Temporal variations,

6.     Chemical exchange models, and

7.     Validation using observations and global/regional chemistry-transport models.

2004 -  2012  Overarching Operational Goals during this period

The goal of the GEIA (Global Emissions Inventory Activity) project is to bring together people, analyses, data, and tools to

(1) quantify the anthropogenic emissions and natural exchanges of trace gases and aerosols that drive earth system changes and

(2) facilitate use of this information by the research, assessment and policy communities.

2012 - Present  New Directions

GEIA aims to be a key forum for emissions knowledge serving stakeholders and decision-makers in a rapidly evolving global society by: enhancing understanding, quantification, and analysis of emissions processes; improving access to emissions information; and strengthening the community of emissions groups involved in research assessment, operations, regulation and policy.  More details are provided in this publication.  New Directions: GEIA's 2020 vision for better air emissions information

Gregory J. Frost · Paulette Middleton · Leonor Tarrasón · Claire Granier · Alex Guenther · Beatriz Cardenas · Hugo Denier van der Gon · Greet Janssens-Maenhout · Johannes W. Kaiser · Terry Keating · Zbigniew Klimont · Jean-Francois Lamarque · Catherine Liousse · Slobodan Nickovic · Toshimasa Ohara · Martin G. Schultz · Ute Skiba · John van Aardenne · Yuxuan Wang

Atmospheric Environment 12/2013; 81:710-712. DOI:10.1016/j.atmosenv.2013.08.063 · 3.28 Impact Factor

2023 - Expanding Partnerships, Interconnectons and Leadership

GEIA Current Overview



1990 - 1996 

Convenor Tom Graedel (USA).

GEIA Web Site and Network Coordinator Paulette Middleton (USA), 

Other Steering Committee Members: Lex Bouwman (Netherlands), Derek Cunnold (USA), and Josef Pacyna (Norway)

1996 - 1998 

Convenor Gregg Marland Convenor (USA)  Steering Committee as above

1998 - 2003 

Co-Convenors Jos Olivier (Netherlands) and Derek Cunnold (USA) 

GEIA Web Site and Network Coordinator Paulette Middleton (USA),

Other Steering Committee Members: Carmen Benkovitz (USA), Gregg Marland (USA), Ann McMillan (Canada), Josef Pacyna (Norway), and Trevor Scholtz (Canada)

2003 - 2010

·Co-Chairs Claire Granier (France,USA) and Alex Guenther (USA)

·GEIA Web Site and Network Coordinator Paulette Middleton (USA),   GEIA/Accent Portal Manager Aude Mieville (France), 

Other Steering Committee Members in 2010:

Toshimasa Ohara (NIES, Japan)

Zbigniew  Klimont  (IIASA, Austria)

Jean-François Lamarque (NCAR,  USA)

Ivar Isaksen (University  of  Oslo,  Norway)

Catherine Liousse  (Laboratoire   d'Aérologie,   France)

Jos Olivier (MNP, The Netherlands)

Jean-François Muller (Belgium)

Klaus Butterbach-Bahl (IMK-IFU, Germany)

Frank Dentener (JRC, Italy)

Laurens Ganzeveld (University Wageningen, The Netherlands)

Claire Reeves (University of East Anglia, UK)

Vigdis Vestreng (Norwegian Pollution Control Authority, Norway)

2012 Co-Chair  Greg Frost (NOAA, USA)

2012 Co-Chair  Leonaor Tarrason (Norway)

2012 - 2014


Executive Committee (Frost, Tarrason, Middleton, Granier)

Gregory J. Frost · Co-Chair

Paulette Middleton · Network Manager

Leonor Tarrasón · Co-Chair

Claire Granier · Database Manager

Other Scientific Steering Committee Members

Alex Guenther · 

Beatriz Cardenas · 

Hugo Denier van der Gon · 

Greet Janssens-Maenhout · 

Johannes W. Kaiser · 

Terry Keating · 

Zbigniew Klimont · 

Jean-Francois Lamarque · 

Catherine Liousse · 

Slobodan Nickovic · 

Toshimasa Ohara · 

Martin G. Schultz · 

Ute Skiba · 

John van Aardenne · 

Yuxuan Wang


2014 - 2019

GEIA Leadership - Executive Committee (Frost, Tarrason, Middleton, Granier)

GEIA Scientific Steering Committee

Leonor Tarrason (Chair) NILU
Greg Frost (Chair) NOAA
Alexander Baklanov WMO
Beatriz Cardenas CAMe
Hugo Denier van der Gon TNO
Claire Granier (Database Manager) CNRS, UPMC
Alex Guenther  UC Irvine
Greet Janssens-Maenhout JRC, EDGAR
Johannes Kaiser MPI for Chemistry
Terry Keating EPA
Zbigniew Klimont IIASA
Catherine Liousse Laboratoire d'Aerologie
Paulette Middleton (Network Manager) Panorama Pathways
Toshimasa Ohara NIES
Ute Skiba CEH UK
Yuxuan Wang Tsinghua University


2020 - Present

GEIA Scientific Steering Committee -- July 2020
Name Affiliation(s) Country
Greg Frost- Co-Chair NOAA USA
Catherine Liousse Co-Chair CNRS France
Paulette Middleton - Network Manager Panorama Pathways USA
Claire Granier - Database Manager CNRS, CIRES/CU, NOAA USA, France
2022-Present - Co-Chairs
Brian McDonald
Cathy Leal-Liousse
Alexander Baklanov WMO Switzerland
Beatriz Cardenas WRI Mexico Mexico
Monica Crippa EC JRC Italy
Hugo Denier van der Gon TNO The Netherlands
Marc Guevara BSC Spain
Nicolas Huneeus Uniivversity of  Chile Chile
Greet Janssens-Maenhout JRC Italy
Johannes Kaiser DWD Germany 
Terry Keating USEPA USA
Sekou Keita University Péléforo Gon Coulibaly Côte d’Ivoire 
Zbigniew Klimont IIASA Austria
Brian McDonald NOAA USA
Katerina Sindelarova Charles University Czech Republic
Allison Steiner University of  Michigan USA
Erika von Schneidemesser IASS Germany
Leonor Tarrason NILU Norway
Yuxuan Wang Tsinghua University, University of Houston China, USA




GEIA is cross cutting IGBP sub-project under IGAC

2004 - 2019

GEIA is cross cutting IGBP subproject of 3 projects: AIMES, IGAC, and iLEAPS

2020 - Present

GEIA is a core program of IGAC.




Core of dedicated participants

25 projects with completed inventories for most

GEIA communication hub <geiacenter.org>  (NASA sponsored)

11 international planning workshops

Growing user community (over 300 on the e-mail network in 2000)

Expanded links to related data base and modeling efforts

Enhanced QA and updating protocols

2000 – 2010

During the years 2004-2009, GEIA established strong links with the European Network called ACCENT (Atmospheric Composition Change: A European Network, www.accent-network.org), which coordinates the European activities on atmospheric composition change.

Key accomplishments include:

Development and continued updating of the GEIA/ACCENT emissions data web portal

Development of the ECCAD database of driving variables,

Intercomparison of biomass burning emissions and other GEIA related projects,

Organization of the 2004, 2006, and 2009 GEIA conferences and multiple planning meetings each year, plus active participation of GEIA leaders at international workshops and other conferences

GEIA web site updates and regular timely communication with the GEIA network.

Growth of the GEIA network to over 1000 members around the globe and plans to extend this network to different communities,

Development of GEIA future plans and implementation of them:

o   New database of scientific papers as well as national and international reports dealing with emissions issues. 

o   Formation of a GEIA working group composed of emission developers and modelers who will compare data sets and implications for modeling is discussed.  

o   Strengthening links with different key regions through creation of regional centers in corporation with other entities and individuals working in these regions.


2010 - 2020

Major activities and accomplishments are summarized in this presentation.

Updates to activities and accomplishments here.






1990   The initial GEIA planning meeting occurred in September 1990, in Chamrousse, France, in association with the 7th CACGP Symposium on Global Atmospheric Chemistry.

1991   Workshop in conjunction with the CHEMRAWN (Chemical Research Applied to World Needs) meeting in Baltimore, Maryland, USA, in December 1991.

1992   Workshop near Oslo, Norway, in June 1992, under the local sponsorship of the Norwegian Institute for Air Research

1993   Workshop near Amersfoort, The Netherlands, in early 1993, under the auspices of the National Institute of Public Health and Environmental Protection.

1993   Workshop in late 1993, at the National Center for Atmospheric Research (NCAR) in Boulder, Colorado, USA. A special focus of this workshop was on communication between GEIA inventory developers and atmospheric chemistry modelers. The workshop was scheduled in conjunction with a symposium on "Challenges in Atmospheric Chemistry and Global Change: Yesterday, Today and Tomorrow," held by NCAR to honor Paul Crutzen on his 60th birthday.

1994   Workshop in conjunction with the Eighth CACGP Symposium and the Second IGAC Scientific Conference at Fuji-Yoshida, Japan, September 1994.

1995   Workshop in Gothenburg, Sweden, in July 1995, following the conference "Acid Reign 95?"

1996   Workshop in Toronto, Canada, May 31-June 2, 1996.

1997   Workshop in Bilthoven, The Netherlands, on 3-4 November 1997. Held back-to-back with the IPCC Expert Meeting on Methods for the Assessment of Inventory Data Quality on 5-7 November 1997.

1998   Workshop at Seattle, Washington (USA) 19-20 August 1998.  Held back-to-back with the Joint International Symposium on Global Atmospheric Chemistry (CACGP/IGAC 1998 Symposium): Ninth Symposium of the IAMAS Commission on Atmospheric Chemistry & Global Pollution (CACGP) and Fifth Scientific Conference on the International Global Atmospheric Chemistry Project (IGAC).

1999   Workshop in Bologna, Italy, on 13 September 1999 in conjunction with the Sixth Scientific Conference of the International Global Atmospheric Chemistry Project (IGAC).

2001   Meeting in Paris France June 2001, held back to back with the POET/IGAC workshop on
"Emissions of Chemical Species and Aerosols into the Atmosphere".

2002   GEIA had an informal informational meeting during the IGAC conference September 18-25, 2002 in Crete Greece.

2004   GEIA/ACCENT Workshop - June 2004, in Paris CNES headquarters reviewed existing research and developed a preliminary plan for the GEIA/ACCENT activities

2006   JOINT ACCENT/GEIA Workshop - February 8-10, 2006 discussed anthropogenic emissions for non-OECD countries in global inventories.  2006 GEIA Conference - Paris, France

2007   GEIA Summer School September 11-20, Ile d’Oléron, France explored “Surface Emissions and Prediction of Atmospheric Composition Changes”

2009   GEIA-ACCENT Open Conference, Oslo Norway October 26-28  addressed “Emissions of Gases and Aerosols: Progress, Modeling Needs, and Emerging Issues”  2009 GEIA Conference - Oslo, Norway

2012 GEIA Conference - Toulouse, France  The 15th Conference of the Global Emissions InitiAtive (GEIA), Emissions to Address Science and Policy Needs, took place on 11-13 June 2012 at the Conference Hôtel d’Assezat in Toulouse, France.

2014 GEIA Conference - Boulder, Colorado, USA  June 11-12, 2014  National Center for Atmospheric Research   Bridging Emissions Science and Policy

2015 GEIA Conference - Beijing, China    Influence of Urbanization on Emissions Worldwide, 18-20 November 2015, Tsinghua University, Beijing, China 

2017 GEIA Conference - University of Hamburg, Germany

2019-2020 GEIA Conference - Hosted by University of Chile Santiago, became virtual due to COVID-19

2023 GEIA Conference - Brussels