Pulp and paper milling has been the dominant industry in Berlin (New Hampshire) over the past century. Residues were disposed at the nearby Mt. Carberry landfill site, causing high emissions of methane gas, the lobal warming potential of which is 21 times that of CO₂. The Androscoggin Valley Regional Refuse Disposal District (AVRRDD) voluntarily installed a landfill gas collection and destruction system at Mt. Carberry. The collected landfill gas is burnt in a controlled way and turned into heat energy. By avoiding methane flaring into the atmosphere this leads to an average annual reduction of 35,000 tons CO₂-equivalents. AVRRDD has constructed a pipeline in collaboration the remaining paper mill in Berlin. The landfill gas substitues fuel oil in their boiler system and thus allows the mill to save heating costs.

The majority of Berlin's inhabitants used to work in the two large local paper mills, one of which has shut down. The town became economically depressed with limited opportunities of decent jobs. Remaining economically viable with the support from carbon finance, the mill now provides sustainable job opportunities.