Why not harvest seemingly limitless wind and sunlight and eliminate the pollution inherent to fossil fuels? Legendary Texas oil man T. Boone Pickens made much the same argument when he promoted wind energy and natural gas during an appearance at Indiana University this month. Yet, a national study issued in August by The Nature Conservancy, a not-for-profit whose mission is to protect ecologically sensitive land and water, raises yellow flags even for wind and solar-not to mention biofuels.

Over the last several months, extensive arrays of thousands of windmills have been placed throughout the landscape of northwestern Indiana. Once located quite a far distance away from the roads , these windmill fields are now prominently visible along several highways just north of Lafayette. Along with the intense search for alternative sources for fuel currently being undertaken by several companies in the state, Indiana is beginning to do its part ...Unfortunately, the rush to place windmills throughout the corn fields along Indiana highways is not as innocent as it might first appear.

Does anyone else hear an echo of the ethanol boom from three summers ago? ...All of this makes the effort to erect two giant wind farms in Boone County, the state's second-windiest locale, worth watching. Putting in the 300-foot turbines is one thing in sparsely populated Benton County, but as Boone County's executive director of the area plan commission, Steve Niblick, said: "We are different than other counties with wind farms."

In advance of the summit, we asked Purdue President Martin Jischke, Amy Myers Jaffe of Rice University's Baker Institute for Public Policy and Sue Cischke, vice president of environmental and safety engineering at Ford Motor Co., to explore issues surrounding the nation's energy needs.