By Wesley Morris Globe Staff It shouldn't take much effort for a documentary about the coal industry to make you mad. The industry's downside seems pretty steep. Appalachian coal companies busted unions, broke laws, lowered wages, poisoned people, and depopulated towns. To better get at the coal seams, the companies cut down swaths of trees and blast away the tops of mountains and dump the debris on the valleys below. Sometimes people live in those valleys. Some of those people appea
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