This illustrates the future unknown issues with respect to chemicals and health/environment. At the moment, we have two schools to handle this: 1. not proved b

This illustrates the future unknown issues with respect to chemicals and health/environment. At the moment, we have two schools to handle this: 1. not proved bad, we allow. 2. not proved good, we disallow. The US is more on the first side and the EU on the second, of course, like for any complex issues, the right decision is context dependent and in the middle. I am working in the area of chemical properties, this is a hard problem and I am sure that when this class of compounds arrived on the market, smart people tried their best to figure out the health implications. We have more tools and experience 50 years later, but we are not smarter. We need to move with caution while handling an increasing market pressure... this is challenging!