Employing the heuristic-systematic information processing model (HSM), this study aims to add engagement as a new dimension in Ohanian’s classic Source Credibility Model (SCM). It further demonstrates its relevance through a mediation framework where content-focused messaging mediates greenfluencers' (sources) attributes and credibility in greenfluencer advertisements (CGA), i.e., sponsored green posts published through their profiles. Indian social media users who are also the followers of gree