Price of going green — $1.2 million for a Ford Focus

One of the greenest cars in the world was in downtown Miami this week. It's a spiffy little Ford Focus with a weird fuel tank. Cost: $1.2 million.

Not too far away from this car was a man promoting the world's greenest light bulb: It uses one-fourth the power of a regular bulb, has no mercury contaminants and lasts for years. Price: $55-$65.

The business rush to green is on, as was shown by the scores of entrepreneurs at Florida Gov. Charlie Crist's second summit on climate change this week at the Hotel InterContinental. There's an unanswered question: At what cost?

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