Can we come up with a meaningful number?

The document describes a 'hazard synthesis' method developed by World Weather Attribution to combine different lines of evidence into a single number representing the influence of climate change on an extreme event's intensity and likelihood. It notes that while this approach is more realistic than using models or observations in isolation, it faces limitations when events would have been impossible in a cooler world or when climate models contradict basic physics, such as the Clausius-Clapeyron relationship. The author emphasizes that human expertise and experience are necessary to evaluate these results, as automated or AI-driven analysis cannot yet account for model deficiencies or data discrepancies.

• The 'hazard synthesis' method allows researchers to combine climate models and weather observations to more accurately capture the overall influence of climate change on the intensity and likelihood of extreme weather events.
• Climate models sometimes fail to align with the Clausius-Clapeyron relationship, which states that a 1C increase in global warming leads to approximately 7% more water vapour and heavier downpours; this is particularly common in countries in the Global South.
• The author argues against the automation of hazard analysis or the use of AI because interpreting results requires evaluating complex factors such as data quality, model consistency, and alignment with physical science.

APA

Otto, F. (2024). Can we come up with a meaningful number? World Weather Attribution. https://www.worldweatherattribution.org/can-we-come-up-with-a-meaningful-number/

Chicago

Otto, Friederike. Can we come up with a meaningful number? World Weather Attribution, 2024. https://www.worldweatherattribution.org/can-we-come-up-with-a-meaningful-number/.

Wikipedia

{{cite press release |last1=Otto |first1=Friederike |title=Can we come up with a meaningful number? |publisher=World Weather Attribution |date=30 October 2024 |url=https://www.worldweatherattribution.org/can-we-come-up-with-a-meaningful-number/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@misc{otto2024can, author = {Otto, Friederike}, title = {{Can we come up with a meaningful number?}}, publisher = {World Weather Attribution}, year = {2024}, month = oct, url = {https://www.worldweatherattribution.org/can-we-come-up-with-a-meaningful-number/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }