BBC: Former UK prime minister Tony Blair has arrived in Japan for talks aimed at ending the "deadlock" over global greenhouse gas targets. He said there was a "consensus" that a deal had to be reached – with a 50% cut in carbon emissions needed by 2050. During his visit to Tokyo Mr Blair will meet climate change experts from China, Japan, Europe and the US. Mr Blair, who stood down as prime minister last year, is also a peace envoy to the Middle East. …