NCGG10

10th International Symposium on Non-CO₂ Greenhouse Gases

January 21-23, 2026, Utrecht, The Netherlands

The 10^th NCGG Symposium on non-CO₂ greenhouse gases targets the greenhouse gases methane (CH₄), nitrous oxide (N₂O), fluorocarbons and SF₆. The contribution to climate warming since the pre-industrial period of these gases together is comparable to the warming caused by CO₂ only (46% by non-CO₂; 54% by CO₂; ref. IPCC AR6).

The importance of this conference is increasing every new event as our window for action in the climate dossier is closing rapidly. Fortunately public awareness that we need to act now is growing. With that awareness “game changers“ are proposed that need scientific evaluation to distinguish realistic and valuable concepts from what is known in The Netherlands as “ride a bike in the sky” ideas.

The scope of NCGG10 will be to identify game changers and evaluate impact of all non-CO₂ components in the climate system with a focus on the non-CO₂ greenhouse gases.

• observation of the current state and trend in the atmosphere, on multiple spatial scales;
• using that information in models to integrate and upscale the available measurement data;
• running models for scenario analyses predictions;
• feeding the results from measurements and models to inventories;
• use inventories and models to inform and predict;
• discuss potential adaptation and mitigation options and policies;
• make scenarios with social economic parameters and integrated environmental assessment;
• discuss the general picture and results with stakeholders, to identify potential game changers with decision makers, industry, the financial & insurance sector, NGOs and international organizations.

We will invite contributions with respect to four themes, covering causes, effects and solutions of the environmental problems associated with non-CO₂ greenhouse gases. These contributions may report on science (from natural, social, technological or integrated sciences) and policy.