Climate change December 24, 2020 7:24 pm Boston Mayor Marty Walsh Discusses New Role as Chair of Climate Mayors Walsh says he hopes to facilitate goals of creating a green economy and carbon emission standards. US & World Videos 2:11 Wheelhouse Diner owner opens up about upcoming closure 2:36 Key witness takes stand in Karen Read murder trial 0:20 President Biden to visit Boston, NH Tuesday 2:14 Karen Read trial: Jennifer McCabe returns to the stand Tuesday 20:18 The Karen Read trial: A look at what's happened so far