BBC: EU leaders meeting in Brussels are under pressure to give the UN climate talks in Copenhagen a firm signal of their commitment to tackling global warming. The EU sees itself as a world leader in this area, having pledged to cut greenhouse gas emissions by 20% by 2020, compared with 1990 levels. A higher target of 30% has been suggested – but only if similar pledges are made by other industrialised powers. Sweden, chairing its last EU summit, has dismissed speculation …