Finally the day you've all been waiting for has arrived: EPA has released its new boiler emissions rules for hazardous pollutants! (The cool kids call it "the boiler MACT.") Most review and discussion of these rules so far has been silent on the most significant aspect: they introduce output-based emissions standards. As Grist readers know, I've been preaching the virtues of output-based standards for years now -- this is a wonky subject, but one greens would do well to understand. Output-based standards have been adopted by several states, but somewhat haphazardly, in part because of a lack of consistent EPA …
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