Business Green: Leaders from a number of EU multinationals including Shell, Tesco and Vodafone are calling for the EU to raise its greenhouse gas reduction target to 30 per cent below 1990 levels by 2020. EU member states currently have a target to reduce their emissions by 20 per cent within the same timeframe, but have promised to up the target if other countries make similar commitments. But a weak agreement at Copenhagen and resistance from the heavier polluting nations have meant the …