"A plastic bag charge is welcome news, but let's not get carried away," spokesman Craig Bennett said.
"If Nick Clegg wants to champion the environment he must do much better - starting by allowing Lib Dem peers to back a 2030 target for decarbonising the power sector when the Energy Bill reaches the House of Lords."
More top news
Speaking publicly about their divorce for the first time, the actress said she is confident she and Brad Pitt will remain a family unit.
Misty low cloud and some patchy fog again tonight but with mild air
Former world title challenger Michael Watson and his carer were assaulted by would-be thieves in an apparent car-jacking attempt.