Rising sea levels, calving icebergs, drought, floods, hurricanes, refugees…. these don’t seem like the stuff of comedy.  Maybe, though, a little laughter is just the sugar we need to help the medicine go down. University of Wisconsin alum Maxwell Boykoff now co-directs “Inside the Greenhouse” project at the University of Colorado Boulder.  The project explores alternative ways of engaging people on climate change issues. For the past four years, Boykoff, his colleagues and students have run “Stand Up for Climate Change,” a comedy festival focused on the warming planet.