A 4ft ice sculpture of Prime Minister Tony Blair's head has been unveiled by environmental activists.
The ice sculpture contains an eco-friendly guide
Their message to Mr Blair is that as his premiership melts away, he still has a chance to make a lasting impact on climate change.
The bust, located in Trafalgar Square, contains a book by campaign group Stop Climate Chaos.
The publication, I Count, which offers tips on how to reduce carbon emissions, will be delivered to 10 Downing Street.
Stop Climate Chaos wants the UK government to take firm action at home and abroad, including setting clear targets on reducing greenhouse gas emissions.
Its director Ashok Sinha said: "The ice sculpture symbolises the fact that time is running out for Tony Blair to take action."
The movement, whose members include Friends of the Earth, Greenpeace, WWF, Oxfam and Unison, is urging sympathisers to join a protest on climate change in Trafalgar Square on 4 November.
The government boasts one of the best records in tackling greenhouse gas emissions and says it has already met its Kyoto targets for 2010.
The 2006 UK Climate Change Programme includes measures to support renewable energy sources, sustainable transport as well as energy efficiency in households and offices.