Guests: MELA Executive Director Carol Becker talks about teaming up with O'Keefe Elementary School to renovate the memorial garden honoring a slain student--she is joined by science teacher Emily Kenny and neighborhood resident Thresa Conley; new chief horticulturist Jennifer Davit for Millennium Park's Lurie Garden, and Sue Markgraf from GreenMark PR talk about managing the garden; Natural Resource Defense Council's Josh Mogerman discusses last weeks oil spill in Romeoville and the wisdom of continuing U.S. dependence on tar sands oil.