Guardian: European Union Last week: The EU ended the week with a bang, upping its offer of climate aid to poorer nations to EUR2.4bn a year from next month. But the bloc’s trump card – an upgrade from a 20% to a 30% cut to its emissions by 2020 – remained unplayed. Despite the stir it caused, chief negotiator Artur Runge-Metzger said the “Danish text” was “just a piece of paper”. This week: The EU will certainly need to table the 30% offer if the talks are to progress. It will also have …