Rev. Margaret Bullitt-Jonas and Lucy Robinson of Grace Chuch, Amherst On September 28, a day after Thomas F. Stocker, co-chair of the Intergovernmental Panel on Climate Change, called climate change “the greatest challenge of our time,” more than 220 people gathered at a United Methodist Church in Springfield for the Second Annual Climate Action Now Conference. Welcomed by reggae music and rap, an unusually diverse group of people from different …