Business Green: The European Union yesterday sought to cement its position as a leader in the fight against climate change, pledging to sign up to more ambitious emission targets if an international treaty is agreed at the UN’s Copenhagen climate change summit in December. European environment ministers meeting to finalise the bloc’s negotiating position ahead of the historic talks reiterated the EU’s commitment to upgrading its 2020 emission reduction target from 20 to 30 per cent in the event of a …