A report quite relevant to the Sears Island Question came out earlier this year - feds and scientists finally taking a long hard look at the effects in New England waters that pollution, development, dams, ballast water discharge, dredging and the whole wretched mess of nonfishing impacts does to the homes and working places of our wild fishes.
The report: Impacts to Marine Fisheries Habitat from Nonfishing Activities in the Northeastern United States, comes in a handy each-chapter-a-seperate-pdf-file format that lets you browse through it easily: (you'll have to click on the above link to read them)
Chapters 2, 4, 5, 6 and 10 are helpful in understanding what harm a port on Sears Island could do. Read 'em!
Chapter One: Technical Workshop on Impacts to Coastal Fisheries Habitat from Nonfishing Activities
Chapter Two: Coastal Development
Chapter Three: Energy-related Activities
Chapter Four: Alteration of Freshwater Systems
Chapter Five: Marine Transportation
Chapter Six: Offshore Dredging and Disposal Activities
Chapter Seven: Chemical Effects—Water Discharge Facilities
Chapter Eight: Physical Effects—Water Intake and Discharge Facilities
Chapter Nine: Agricultures and Silviculture
Chapter Ten: Introduced/Nuisance Species and Aquaculture
Chapter Eleven: Global Effects and Other Impacts
Chapter Twelve: Compensatory Mitigation
Conclusions and Recommendations