Senate Environment and Public Works Chairman Barbara Boxer (D-Calif.) said Wednesday that she is establishing five working groups to investigate matters related to climate change legislation as her committee moves toward introducing a bill later this year.Boxer, speaking at a Roll Call policy breakfast, said the working groups will be broken into five issue areas: coal research, timetables and state roles, market oversight, regional issues, and offsets and allowances.She did not name leaders of the working groups, but indicated that the membership of the groups will include Senators both on and off the committee.The House is holding hearings this week on climate change legislation offered by Energy and Commerce Chairman Henry Waxman (D-Calif.). Boxer said her committee will use “several models— for legislation, including the Waxman bill and climate change legislation that she introduced last year with Sen. Joe Lieberman (ID-Conn.) and former Sen. John Warner (R-Va.).