KOLKATA, 23 JAN: At a time when the chief minister, Miss Mamata Banerjee, has assured to provide a cleaner and greener city, her party leaders are backing a wagon-manufacturing factory on Jamir Lane in Ballygunge which is allegedly polluting the environment of the area. Hapless members of Jamir Lane Residents’ Association have written to the chief minister seeking her intervention. Earlier, local residents shot off letters to the state pollution control board and environment minister Dr Sudarshan Ghosh Dastidar.