Is ecotech the new asbestos?

What will remain of greentech, cleantech and ecotech if nanotechnology turns out to be harmful for humans and the environment?

It’s hard to keep track of the soon-to-be-implemented technological solutions that will solve our energy and environmental woes by means of nanotechnology – the science of manipulating individual atoms. Solar panels and batteries might be far from optimal solutions now, but nanomaterials will boost their efficiency and dramatically lower their costs. Transporting electricity from solar plants in deserts may not be possible yet, but nanotechnology will bring us cheap superconducting cables and efficient hydrogen storage. Unfortunately, more and more research indicates that nanomaterials might become a severe health problem and an environmental nightmare.