The gulf’s lobster population is likely to plunge by 40 percent to 62 percent over the next 30 years, according to a new report that the institute published with the University of Maine and the National Oceanic and Atmospheric Administration. Sixty-nine percent of Mainers believe global warming is occurring, and a majority believe that humans are contributing to it, according the Yale University Program on Climate Change Communication. A $49-per-ton fee, increasing by 2 percent per year, would produce $2.2 trillion over 10 years, according to the U.S. Treasury.