International Herald Tribune: On Monday many people are celebrating Earth Day by admiring the beauty of our planet and by calling attention to the environmental dangers it faces.
While the focus is on the planet, economists are warning that carbon emissions could cause grave damage to something else green and dear.
The value of carbon-based investments -- many traded publicly -- could implode once governments start seriously curbing emissions, bursting what some have dubbed "the carbon bubble."
A report released by the...