Pat Mooney

Executive director, ETC Group

There have been 11 negative studies on nanotech's effect on health and the environment, and they're coming from DuPont and NASA and major universities, not from Greenpeace. Meanwhile, products with nanomaterials are slipping through FDA loopholes and making it to market without proper testing.

Kevin Ausman

Executive director for operations, Center for Biological and Environmental Nanotechnology, Rice University

It's always dangerous to take early studies and try to make generalizations. Nanotech is certainly not completely new or unnatural. Natural nanomaterials are released in the environment - through forest fires, volcanic eruptions, diesel exhaust. Once we figure out what's analogous to current systems, we'll find that we have already done a lot of the work of testing.

Christine Peterson

President, Foresight Institute

A huge number of new chemicals are produced every year, and 85 percent of those submitted to the EPA have no health data at all. But bringing the industry to a standstill is not the answer. The way to drive forward is to speed development of molecular manufacturing.

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