Independent: Green groups accused the European Union of watering down its trail-blazing pledge to tackle climate change last night, after EU leaders made concessions to “dirty” industries in Germany and eastern Europe. The compromise allowed the EU to agree on its commitment to cut emissions of greenhouse gases by 20 per cent by 2020. Its leaders said the deal, and the election of Barack Obama, will boost the prospects of a historic global agreement on climate change in talks in Copenhagen in a …