One Lever

Eleven questions. Two minutes. No account, no ads, nothing leaves your phone. You get your annual carbon footprint, the single biggest change available to you, and one habit to start this week — with the source for every number. Factors from the EPA, EIA, UK DEFRA, and Our World in Data. Your AI chatbot use is in there too, in proportion. WHAT YOU GET • Your estimated annual footprint, rounded honestly — the quiz uses ranges, so the app says "about". • Your biggest lever: the one change that would move your number most, whether or not it's easy. • Start this week: the largest day-to-day change, with a cue so it actually happens. • A Sources screen with every figure traced to a named public or peer-reviewed source, and a plain list of what the app doesn't model. WHAT IT ISN'T • No account, no login, no tracking, no analytics, no ads. • No offsets for sale. • Not a certified calculation —…