An entrepreneur whose company specializes in a safe and environmentally friendly supply of renewable hydrogen energy will speak at the University of Colorado at Boulder College of Business on Monday, March 5. G. Chris Andersen, chairman of Millennium Cell Inc. of Eatontown, N.J., will talk on "Digits, Energy, Fuel Cells, Hydrogen and the New Economy" from 9:30 a.m. to 10:30 a.m. in room 224 of the College of Business. The presentation is open to the public.