10th International Symposium on Non-CO Greenhouse Gases

The 2026 NCGG-10 Symposium on non-CO2 greenhouse gases targets the greenhouse gases methane (CH4), nitrous oxide (N2O), fluorocarbons, and halogenated species (HFC/CFC/HCFC/SF6, etc.). Since the combined contribution of these gases to climate warming since the pre-industrial period is comparable to the warming caused by CO2 alone (46% by non-CO2; 54% by CO2; ref. IPCC AR6), we refer to them collectively as "the other half of the problem." Especially CH4 is becoming increasingly important. Attention should also be given to the impact of hydrogen (H2) and aerosols as short-lived climate forcers agents.

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