Excerpt from cnn.com

Imagine you’re the kind of person who worries about a future when robots become smart enough to threaten the very existence of the human race. For , you’ve been dismissed as a crackpot, consigned to the same category of people who see Elvis lurking in their waffles.

In 2014, you found yourself in good company.

This year, arguably the world’s greatest scientific mind, Stephen Hawking, and its leading techno-industrialist, Elon Musk, voiced their fears about the potentially lethal rise of artificial intelligence. They were joined by philosophers, physicists and scientists, all of whom spoke out about the serious risks posed by the development of greater-than-human machine intelligence.

In a widely cited op-ed co-written with MIT physicist Max Tegmark, Nobel laureate Frank Wilczek and computer scientist Stuart Russell, Hawking sounded the AI alarm. “One can imagine (AI) outsmarting financial markets, out-inventing human researchers, out-manipulating human , and developing weapons we cannot even understand. Whereas the short-term impact of AI depends on who controls it, the long-term impact depends on whether it can be controlled at all.”

Musk was reportedly more emphatic, on his tweeted warnings by calling AI humanity’s biggest “existential risk” and likening it to “summoning the demon.”

The debate over AI was given a big boost this year by the publication of philosopher Nick Bostrom’s “Superintelligence: Paths, Dangers, Strategies,” which makes a close study of just why and how AI may be so catastrophically dangerous (2013’s “Our Final Invention” by documentarian James Barrat makes a similar case).

Bostrom: When machines outsmart humans

Bostrom the director of the Future of Humanity Institute at Oxford, one of several new institutions devoted to studying existential threats to the human race, of which AI figures centrally. In May, the Massachusetts Institute of Technology christened its own Future of Life Institute. In the academic community at least, AI anxiety booming.

They’re right to be worried.

The first and most immediate issue is the potential for AI to put large numbers of humans out of work. A study by Carl Frey and Michael Osborne of Oxford’s Program on the Impacts of Future Technology put the matter starkly. In their analysis of over 700 jobs, almost half could be done by a computer in the future. This of computerization could destroy not simply low-wage, low-skill jobs (though those are in acute danger) but some white-collar and service sector jobs previously thought to be immune as well. Technology is marching on both our manual and mental labor.

As serious a threat as widespread job loss is, we’ve seen this before. During past technological upheavals, humans have cleverly created jobs and industries from the ashes of obsolete . We may be able to keep our collective heads above water even if AI encroaches on more creative and intellectual industries (heck, we may even start working less).

What we should be more concerned about is humanity losing its perch as the Earth’s foremost intelligence.

For those anxious about AI, current efforts to develop -correcting algorithms (“machine learning”), coupled with the relentless growth in computer power and the increasing ubiquity of sensors collecting all manner of intelligence and information around the world, will push AI to human and ultimately superhuman intelligence. It’s an event that’s been dubbed “the intelligence explosion,” a term invoked in 1965 by computer scientist Irving John Good in a paper outlining the development path for artificial intelligence.

What makes an intelligence explosion so worrisome is that intelligence is not a tool or a technology. We may think of AI as something that we use, like a hammer or corkscrew, but that’s fundamentally the wrong way to think about it. Sufficiently advanced intelligence, like ours, is a creative force. The more powerful it is, the more it can reshape the world around it.

Artificial intelligence does not need to be malevolent to be catastrophically dangerous to humanity. When computer scientists talk about the possible threat to humanity from superintelligent AI, they don’t mean the Terminator or Matrix.

Instead, it’s typically a more prosaic end: humanity wiped out because an AI tasked with a simple goal (say, paper clips, an example that is often used) requisitions all the energy and raw materials on Earth to relentlessly churn out paper clips, outsmarting and out-maneuvering all human attempts to stop it. In Hollywood’s telling, there are always humans left to fight back, but such an outcome is implausible if humanity is faced with a truly superior intelligence. It would be like mice attempting to outwit a human (we’re the mice). In that event, AI researchers like Keefe Roedersheimer see a less inspiring finale: “All the people are dead.”