What's the Point of Earth Day?

Some say the celebration has lost its edge.

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Writes Elizabeth Kolbert: "This week, when Earth Day turns thirty-nine, the New York City Department of Parks and Recreation will plant trees. The Interior Department will host a fair in Washington's Rawlins Park, and in Bloomington volunteers will teach sixth graders about karsts and creeks. As perhaps befits a middle-aged celebration, these are all eminently reasonable activities. But Earth Day has lost its edge and, with that, the sense that a different world is possible." What's the point of Earth Day? Is Kolbert right that the celebration no longer sparks the imagination of participants? Did it ever? Post your thoughts.

Previously: Is Meghan McCain the Future of the GOP?