With enthusiasm echoing the early days of the dot-com boom and the heady days of sub prime loans and home flipping, would-be entrepreneurs are starting to gamble that the solution to their economic puzzles is spelled e-n-v-i-r-o-n-m-e-n-t. But are they kidding themselves? Will a wind turbine manufacturer or biofuel harvester generate stock prices beyond everyone's wildest expectations, only to tumble like the next Enron? Will green investment lead to gold, or more empty pockets?