Computing acid rain

In 1983, NCAR launched the Acid Deposition Modeling Project, cosponsored by the U.S. Environmental Protection Agency. Over four years, the project, led by Julius Chang, depicted here, used NCAR supercomputers to analyze acid rain and related environmental threats. Its findings fed into the ten-year-long National Acid Precipitation Assessment Program, which concluded in 1990 that acid rain was a serious but manageable problem.