The budding clean technology boom may be showing some signs of overheating even as it enters our homes and offices, causing some to wonder if the industry is headed for a bust of dot-com proportions. New York's Lux Research, for example, recently warned that a bubble is forming, pointing out that venture capital investment in the industry doubled last year and IPO valuations are soaring. However, Greg Curhan, a founder of San Francisco investment bank Merriman Curhan Ford & Co., which is hosting a Next-Generation Energy Conference in New York Tuesday, notes that one difference is that cleantech companies have "tangible book value, such as manufacturing plants and equipment." — Mary Kathleen Flynn

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