While Congress continues to work on new US climate change legislation, the US Environmental Protection Agency (EPA or Agency) is rapidly cranking out greenhouse gas (GHG) regulations under the existing Clean Air Act (CAA). Two of the Agency’s recent initiatives — a final rule requiring annual reporting of GHG emissions and proposed thresholds for GHG emissions under the CAA’s Prevention of Significant Deterioration (PSD) and Title V permitting programs — are addressed below.

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