Who contributed

“Using an instrumental-variable design for Chinese scholars, the study estimated that a 1 μg m−3 increase in annual PM2.5 caused a 0.23% decline in academic publications, with larger effects during…” · 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.

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