CASE STUDY U.S. Climate Reference Network As concern over changing climate conditions in the world was grow- ing in the late 1990s, the U.S.A. had thousands of weather measurement stations collecting data. However, it was determined that many of the stations were inconsistently sited and managed, were aging, and were in danger of losing credibility. The best of those stations, called the Histori- cal Climate Network, collected good data as far back as the 1930s. To provide reliable information to those evaluating the potential effects of climate change, the network of temperature-measurement sta- tions needed to be improved. Huge amounts of historical climate-obser- vation data needed to be verified, and a program was required that would provide continuous, homog- enous weat

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