Reuters: Talks on a U.N. climate pact have become bogged down like “walking in wet sand” but a U.N. summit this month could give impetus for a deal due in December, the head of a key U.N. negotiating group said on Wednesday. Michael Zammit Cutajar, who chairs a group of 190 nations working on the planned climate pact due to be sealed in Copenhagen on December 18, said a draft text was still 200 pages or more long despite efforts to cut back at a U.N. meeting in mid-August. “I think …