This article examines environmental communication from within an enquiry perspective. It is argued that dissent is a vital part of any enquiry into environmental issues. Aspects of Charles S. Peirce's semiotic logic are introduced and discussed with reference to environmental communication and dissent. Environmental problems are shown to be at root disconnections between the sign use of humans and the sign use of an environment. Such disconnections arise when dissenting voices from an environment are ignored, misinterpreted, or suppressed. It is (...) concluded that a semiotic approach to environmental communication offers a valuable insight into how dissent functions to resolve environmental disconnections. (shrink)