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He reviewed the President 's Agenda for Action , issued in September , 1993 , and reported on the state of play in the nine areas of concern identified by the Administration . The draft final assessment outlines the findings of the Board 's Atmospheric Acidity Protection Program . By the next major American exposition , the World 's Columbian Exposition held in Chicago in 1893 , the biggest attractions were the dynamos in the Electricity Building . Here ’ s World ’ s guide to where the science ends — and the science fiction begins . Aqua 's Atmospheric Infrared Sounder spectrometer and its two companion instruments-the Advanced Microwave Sounding Unit and the Humidity Sounder for Brazil - - will measure Earth 's atmosphere and surface , allowing scientists to improve weather prediction and observe changes in Earth 's climate .