Financial Times: At the end of their two-day summit in Brussels last week, European leaders pledged to pay a “fair share” to developing nations to help them fight global warming and adapt to its consequences. Yet they failed to deliver the one thing that environmentalists most desired: money. The omission of a specific contribution, as well as unresolved questions about how the EU would pay for it, has become the latest stumbling block along the path to a global climate deal that world leaders will …