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The DOE Energy Exascale Earth System Model is on GitHub: https://github.com/E3SM-Project/E3SM

Here is some analysis of how the predictions made by some climate models have done: https://www.carbonbrief.org/analysis-how-well-have-climate-m...

They have done a remarkable job since the 1970s.

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Unpopular opinion warning: Not an expert here but I worked on NASA's "Mission to Planet Earth" program for a few years. Cherry-picking of models that produce results that meet the current agenda is not uncommon. Just as researchers have a (deserved IMHO) reputation for publishing data that concurs with their topics...

https://journals.plos.org/plosone/article?id=10.1371/journal... [...]" found 64% of surveyed researchers reported they had at least once failed to report results because they were not statistically significant (cherry picking); 42% had collected more data after inspecting whether results were statistically significant (a form of p hacking) and 51% had reported an unexpected finding as though it had been hypothesised from the start (HARKing)."

https://www.env-econ.net/2017/07/cherry-picking-results.html

https://ori.hhs.gov/videos/case-study-list/3037

https://www.pnas.org/content/pnas/early/2018/03/08/171075511...

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