Paul Gruber from the Erb Institute state that the The Clean Tech Revolution is logically organized and is " an excellent resource for those who would like a solid understanding of clean tech and the potential of each sector " . He also say that it is very useful for those seeking out the names of companies , NGOs , agencies , and people working on each technology . Gruber identify one omission : the concern that major investments in clean technology parallel those made during the Internet boom , with the attendant fear that there " may be a bubble burst with clean tech " .