I was disappointed in how little time you spent addressing the relationship between natural gas and

climate change. You say gas's benefit is "less clear-cut, but it's there." There is a growing body of

evidence, most importantly work about to be published by Robert Howarth, that it's not there. If the

production of shale gas moves us in the wrong direction regarding climate change, that is a very serious

mistake. This question deserves the thorough coverage for which your magazine has distinguished itself.