DENVER, July 23 (RIA Novosti) - The global market for nanotechnology will be worth $2 trillion by 2015, the U.S. transportation secretary told an international conference of nanotechnology experts.

Rodney E. Slater, speaking at the three-day nano renewable energy conference in Denver, Colorado, which ended on Tuesday, said that during 2007 nanotechnology sales totaled $50 billion, and that with technological advancements sales this year will be around $150 billion.

The industry will grow to $800 billion by 2010, he said.

Slater said that over the past seven years the U.S. has invested around $8.5 billion in nanotechnology.

On the first day of the summit Michael Bruce, senior advisor for finance at the US Department of Energy's Office of Energy Efficiency and Renewable Energy, described nanotechnology as an important sector for national security, finance and environmental protection.

Russia was represented at the conference by a delegation from state nanotechnology company Rosnanotech, led by general director Leonid Melamed.