MA DEP Proposed 1990 Greenhouse Gas Baseline and 2020 Business as Usual Projection Posted on June 1, 2009February 1, 2015 NEPGA provided comments regarding the MA DEP proposed 1990 greenhouse gas baseline and 2020 business as usual projection. nepga_comments_on_1990_baseline_and_business_as_usual_projection1.pdf Posted in Document Archive and tagged Massachusetts.