We have blogged this story before, but it has fresh legs. UK Prime Minister, Tony Blair will hold a mini-summit with the German chancellor, Angela Merkel, in Berlin tomorrow amid signs that he really wants to crown his 10-year premiership with an international breakthrough on climate change in June.

Blair will seek to capitalise on what Downing Street believes to be a sea change in attitudes to the risks of global warming to secure agreement on the elements of a post-Kyoto treaty to curb carbon emissions by the time Germany hosts the G8 summit in June.

So will the history books be kind to Blair?