References#
David S. Lee, David W. Fahey, Agnieszka Skowron, Myles R. Allen, Ulrike Burkhardt, Qi Chen, Sarah J. Doherty, Sean Freeman, Piers M. Forster, Jan Fuglestvedt, Andrew Gettelman, and others. The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018. Atmospheric Environment, 244:117834, 2021. Aviation ERF assessment; basis for the non-CO$_2$ multiplier ordering in \texttt nonco2.ts and the contrail CO$_2$-equivalence ratio in \texttt contrails.ts. doi:10.1016/j.atmosenv.2020.117834.
Maria Sand, Ragnhild Bieltvedt Skeie, and others. A multi-model assessment of the global warming potential of hydrogen. Communications Earth & Environment, 4:203, 2023. Cited in the HyFlux claim register (BC-12) for GWP100 values of hydrogen and methane; Boeing's citation attribution for the methane value is recorded as an open evidence-gap question.
Nicola Warwick and others. Hydrogen's atmospheric impact and its 100-year global warming potential. 2023. GWP100(H2) approximately 11.6; see HyFlux claim register BC-12 regarding attribution in Boeing's fugitive-emissions article.
Argonne National Laboratory. GREET Model (Greenhouse gases, Regulated Emissions, and Energy use in Technologies). https://greet.anl.gov/, 2023. Order-of-magnitude reference for biomass-to-fuel conversion yields and feedstock carbon intensities.
Boeing. CASCADE Technical Documentation. https://docs.cascade.boeing.com/, 2026. Methodology reference for the HyFlux parity programme; content © Boeing. Accessed 2026-07-18.
IATA. World Air Transport Statistics 2024. International Air Transport Association, 2024. 2019 global passenger load factor (approx. 82.6%) used for CASCADE-reproduction scenarios.
ICAO. CORSIA Default Life Cycle Emissions Values for CORSIA Eligible Fuels. Technical Report, International Civil Aviation Organization, 2022. Source of the default SAF feedstock carbon intensities used in the HyFlux energy model.
IPCC. Climate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, 2022. Removal pathway potentials (WGIII Ch. 12) used for HyFlux removal-capacity defaults.