Changing to DST affects more than energy use. Even with powerful scheduling programs and large computers, international air travel gets very hard to manage during the changeover, as runway usage also changes with the clock. A week ago, the Carroll County Times reported that there's not much time or energy savings for farmers. For example, dairy production may go down during the transition periods between standard and daylight saving times as farmers and cattle adjust to the change. And while farming activities follow the sun, markets adjust their clocks, resulting in annoying dislocations for farmers in scheduling deliveries.