European Union Summit is to begin in Brussels, Belgium later tonight. Issues like Climate change and the Lisbon reform treaty are set to dominate in the two-day summit. The 27 bloc's leaders will try to iron out their differences over how much each EU member should pay to help developing nations fight global warming. But Denmark expressed doubts that a binding deal could be reached at December's Copenhagen Climate Summit. During the two-day talks, EU leaders are also expected to discuss who should become the first full-time president of the 27-member bloc of about 500 million people. Former British Prime Minister Tony Blair and Luxembourg Premier Jean-Claude Juncker have been touted as the leading candidates for the job.