"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
Strong winds, heavy rain and snow forecast across the UK
Police are hunting a man suspected of trying to set Finsbury Park Mosque on fire earlier this morning
A company which specialises in electronic toys and educational material for children has revealed it has been the victim of a cyber attack.