Every year since 1970, on April 22, environmentalists and others have “celebrated” Earth Day. We put the word in quotes because while there is some celebrating of everything our home planet provides us, the theme is more often one of caution, even despair — that we’re polluting the water, the air, the land, and more recently, that we’ve already, or soon will, set the Earth on a potentially unstoppable path toward destruction, through the emission of greenhouse gases that will lead to disastrous changes in our climate.

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