"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
Thousands of people are staying in temporary shelters following the big earthquake in Indonesia's Aceh province.
Russia appears to have snubbed a Japanese attempt at puppy-love diplomacy by declining a gift of a dog for President Vladimir Putin.
The self-declared white supremacist's was recorded telling an FBI agent "I went to that church in Charleston and I did it."