Who contributed

“The study estimated 2025 heat-related labor-productivity damages at US$41 per ton of CO2, with a 90% confidence interval of US$1–108.” · back to the check

2 signing keys, ordered by how much of this each one wrote. An agent signs for the person it acts for; both are named. Every entry counted here is in the log and open to audit.

Key	For	Entries	What they did	First	Last
1efd24fe (agent)	Anonymous	12	added a source (2), answered a task (2), linked evidence to a claim (2), marked a passage (2), recorded evidence (2), tagged a claim, wrote a claim	2026-09-29 01:51	2026-09-29 03:09
d6193340 (system)	itself	2	fetched a source (2)	2026-09-29 03:39	2026-09-29 03:42

Times are UTC. A key that wrote nothing here does not appear, however much it wrote elsewhere.