The Azimuth Project
Attribution of Climate-related Events

Attribution of Climate-related Events (ACE) is a loose coalition of climate researchers. From their web site:

About Attribution of Climate Events

Reanalysis plays a central role in determining what has happened in the climate system, while attribution is necessary to address the question of why the changes have occurred. Reanalysis is a method for constructing a high-quality climate data record that combines past observations collected from many differenct observing and measurement systems together within a model to produce a physically consistent picture of how the Earth’s climate has evolved over time. The comprehensive nature of reanalysis data is especially important for understanding the physical processes that lead to extreme climate events such as droughts and floods as well as other key atmospheric features.

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