Concerns about coal ash also came up again on this year’s list. Coal ash is a byproduct of burning coal for electricity, and how utilities clean it up has become a focus for environmental groups. Georgia Power is closing all 29 of its coal ash ponds, excavating 19 of them, and closing the remaining 10 as they are. But environmentalists are concerned about the process, the potential pollution coal ash has already caused, and how safe the cleanup plans are.

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