Environmentalists See Risks, Rewards In Nanotechnology; Keeping Eye On "Nanotoxics'; Emerging field could boost efficiency and help fight pollution, but dangers exist.(INTERNET & TECHNOLOGY)

Byline: J. BONASIA

The huge promise -- and potential peril -- of nanotechnology has environmentalists in a quandary.

The emerging field, which tinkers with materials at the atomic level, has the potential to create cleaner energy sources and eco-friendly products. But as with biotech, there are fears that nanotech could wreak havoc with the environment.

For now, green advocates appear to be cautiously optimistic about the technology. Many see it as a way to cut pollution and relieve human suffering. But they want to carefully assess nanotechnology as it evolves.

"Nanotech is not understood by most Americans," said Adam Werbach, former president of the Sierra Club, at an event hosted by the Foresight Nanotech Institute. "This is the critical moment to encourage social debate."

Nanotech is expected to revolutionize all sorts of industries. The technology could create building materials that are much stronger and lighter. Carbon nanotubes already are used in car moldings and tennis rackets. And some day such tubes may even be used to build elevators to space.

Computer chipmakers use nanotech to create advanced memory systems. Breakthrough drug therapies and health treatments are expected as well.