My own suspicion is that a stand-alone artificial mind will be more a tool of narrow utility than something especially apocalyptic.
Jamais CascioAs our various electronic devices gain more and more sensory awareness, we open up the potential for entirely new forms of interaction. Not just new interfaces - tapping and shaking and whatnot - but a shift in presence.
Jamais CascioHuman civilization has been changing the Earths environment for millennia, often to our detriment. Dams, deforestation and urbanization can alter water cycles and wind patterns, occasionally triggering droughts or even creating deserts.
Jamais Cascio