By Jessica Frank-Keyes Britain’s transition to renewable energy is the “economic justice, energy security and national security fight of our time”, Ed Miliband has said, as he pledged to “take on the blockers”. The energy security and net zero secretary told Energy UK’s annual conference in London that fossil fuel “dependence” continued to leave the UK “deeply vulnerable as a country”. Miliband, who is spearheading the government’s manifesto pledge to set up publicly-owned firm GB Energy, said: “The government’s view is that we simply can’t go on like this.” The cabinet minister argued that as…