The effort to bring a natural gas pipeline from the North Slope to Nikiski may be running out of gas. Market conditions have changed a lot in the six years since the Alaska Gasline Development Corporation was formed by the legislature. In a presentation to a joint meeting of the Kenai and Soldotna Chambers of Commerce Wednesday, former Borough Chief of Staff Larry Persily, who has tracked this and previous plans for an instate gas line over the years, laid out the numerous challenges that he says make the project next to impossible, at least for now.