Business Green: Pop stars and politicians are taking centre stage in a growing row over a Canadian company’s acquisition of 10 per cent of the Icelandic energy sector. Vancouver-based Magma Energy’s proposed acquisition of privatised Icelandic firm HS Orka is being subjected to yet another review, following accusations that the company is trying to buy up the stricken country’s entire energy sector. Pop star and actress Bjork has spearheaded a campaign against the Canadian firm, which has been …