On Saturday morning, the white stone buildings on UC Berkeley’s campus radiated with unfiltered sunshine. But instead of enjoying the beautiful day, 200 adults had willingly sardined themselves into a fluorescent-lit room in the bowels of Doe Library to rescue federal climate data. …Groups like DataRefuge and the Environmental Data and Governance Initiative, which organized the Berkeley hackathon to collect data from NASA’s earth sciences programs and the Department of Energy, are doing more than archiving. Diehard coders are building robust systems to monitor ongoing changes to government websites. And they’re keeping track of what’s already been removed—because yes, the pruning has already begun…..