Sierra Club's top 10 neighbors span journalists, politicians, activists, news publishers, and a musician — with no other Environmental organization appearing in the set. The scores compress into a narrow band from 0.96 down to 0.94, the defining feature of a flat shape: no single neighbor dominates, and the audience overlap is broadly distributed across a politically engaged media ecosystem.

InsideClimate News leads at 0.96, followed closely by Senator Jeff Merkley (0.95) and Dr. emptywheel (0.95). Tallying the subcategories across all 10 neighbors: Journalists account for three entries — emptywheel, Bill McKibben, and Kyle Griffin — while Politicians contribute two: Merkley and Robert Reich. The remaining five slots go to a Non-Profit (Brennan Center, 0.95), a News Publisher (InsideClimate News), an Author (Jared Yates Sexton, 0.94), a Musician (Mikel Jollett, 0.95), and an Actor (Julia Louis-Dreyfus, 0.94). The cross-kind pattern is pronounced: Sierra Club's own subcategory — Environmental — does not appear once in the top 10. Instead, the audience shape aligns most tightly with political journalists, progressive politicians, and civic-minded non-profits, with a secondary presence of cultural figures like Jollett and Louis-Dreyfus.

The flat distribution across this mix suggests an audience defined less by environmental identity alone and more by a broad orientation toward progressive politics and accountability journalism.