Radiohead frontman Thom Yorke has added his voice to Friends of the Earth's Big Ask virtual campaign.
The singer appears on a YouTube clip posted by the charity, calling on his MP to remind the government about its environmental pledges.
Yorke said he was "proud to be part of the Big Ask" and that he would do his bit to ensure the government acted on its promises.
"[I'm] asking my MP, reminding my MP, to remind Gordon Brown that he's committed to a bill to reduce our CO2 [carbon dixoxide] emisisons double-quick time and if he doesnt we're going to come down on him like a tonne of bricks," Yorke added.
The Radiohead frontman has supported the charity throughout its campaign and performed an acoustic set to raise awareness of climate change.
Fellow musician Johnny Borrell, the lead singer of Razorlight, has also become involved in the movement, recording a track called The Funeral Blues for the charity.
"I saw Al Gore's film An Inconvenient Truth and I got inspired to get in touch with Friends of the Earth," Borrell said.
"It makes a lot of sense to me, I think it's a great campaign."