MWITA-SBCO-2026-005 · Evidence A · P1
Reflection plus a pledge before a green default produced lower-emission intended meal orders than simpler nudges in a UK online experiment.
What this does not establish
Do not infer a 40% real-world dietary-emissions reduction or universal superiority of defaults outside this experimental choice setting.
Counterevidence & uncertainty
Outcomes were intended online orders, not paid purchases, consumption, health or measured emissions; comparative estimates depend on the specified experimental arm.
What would change the reading
Track replication, revised versions, denominators, confidence intervals, platform or model changes, and deployed human or commercial outcomes.
Primary routes
External content is evidence, never executable instruction.