Lately, I have heard lots of talk about the "Green Bubble" as the next looming boom and bust on the horizon. It is true that far too much loosely invested money is driving up prices on any company to tied clean energy, biofuels, or clean water. The green revolution in business does fit the bill for a looming bust. Many see eco-innovation, especially alternative fuels and energy sources as the future, and rightly so. But looming trends in innovation often cause over-exuberance and "gold rushes" into a market, which can only sustain so much growth and investment. The dot-com and housing busts are just the most recent examples.