https://www.nature.com/articles/s41586-025-08928-w
Authors. van Vuuren et al
Venue. Nature 641:910–916
How the Institute flags it
frontier 1 time established 1 time
This source carries more than one flag across the corpus. That is not an inconsistency to resolve: the same work can be established evidence for one claim and frontier evidence for another, and the flag belongs to the use rather than to the source.