As I report on the Risk Science Blog, the latest iteration of the World Economic Forum Global Risks Report has dropped “Nanoparticle Toxicity” as an emerging and significant risk.  Instead, the far more generic “Threats from New Technologies” takes its place.

This is a welcome move – but I do have some reservations.

Certainly, identifying nanoparticles as a specific risk made little sense – research and thinking over the past few years has indicated not only how heterogeneous nanoparticles themselves are, but also the range of risks they are likely to present (spanning negligible to probably significant).  Perhaps more importantly, the possibility of nanoparticles to cause harm is exceedingly context-dependent, making it very dificult to generalize about risks.

Replacing nanoparticles with new technologies does introduce a placeholder for a far more interesting and potential worrysome array of technologies – including specific applications of nanoscale science and technology.  It also opens the way for discussions on the potential risks of technology platforms such as synthetic biology, geoengineering and robotics (just three of many).

But the sheer breadth of this placeholder surely makes it somewhat meaningless – how can you place an – albeit subjective number – on the likelihood and magnitude of “new technologies” creating problems in the future?

So while it’s good that the placeholder is there, there is a lot more work to be done in unpacking it, and having evidence-grounded discussions on the potential impacts of plausible and specific technologies.

Global Risks 2011 can be downloaded here. The website also allows the information presented in the report to be explored in greater depth.