When machines acquire an intelligence superior to our own, they will be impossible to keep at bay... [Human-level AI] will threaten the very existence of human life as we know it... We should not... expect the main battles of the twenty-first century to be fought over such issues as the environment, overpopulation, or poverty. No, we should expect the fight to be about how we cope with [AI]; and the issue [of] whether we or they — our silicon challengers — control the future of the earth.

Crevier, AI: The Tumultuous History of the Search for Artificial Intelligence, p. 341