https://journals.plos.org/climate/article?id=10.1371%2Fjournal.pclm.0000133
Authors. Bromley, Khan & Kenyon
Venue. PLOS Climate (proponents publishing the fatal number about their own concept)
How the Institute flags it
frontier 1 time speculative 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.