Protest movements are continually appropriating new technologies. This chapter examines the early stages of computer-mediated communication (CMC) use and emphasises that this was a crucial period which determined frameworks of technology use. It explores how the technological changes have influenced environmental politics. The chapter also examines the broader implications of CMC use for social movements. CMC is facilitating the decentralisation of the environmental movement and the rise of grassroots activism. Cyberspace, and the use of CMC, constitute a contested terrain for environmentalists. The increasingly high profile of environmental internet activism in the mainstream media has focused attention on the use of the technology for subversive purposes, and has given their opponents cause to constrict activists' use of CMC. The chapter concludes by examining the possibilities for online activism.