Amid concerns that the planet is warming, the market for clean, green technology is beginning to show signs of overheating, too.
"I call it the global warming bubble," said Robert Metcalfe, who knows something about bubbles. An inventor of the Ethernet networking standard and the founder of 3Com, whose stock plummeted when the technology bubble burst in 2000, Metcalfe now serves as chief executive of a biofuel start-up, GreenFuel Technologies.
But while the flurry and investment that comes with a bubble creates a froth that inevitably results in some big losses, Metcalfe and others argue, it also creates an environment where disruptive ideas can emerge and change the world.
"What bubbles do is they're an accelerator in technological investments to be made; they cause the status quo to be questioned," Metcalfe said.
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