This story was originally published by Wired and is reproduced here as part of the Climate Desk collaboration.

On Feb. 11, the white stone buildings on UC Berkeley’s campus radiated with unfiltered sunshine. The sky was blue, the campanile was chiming. 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.

Like similar groups across the country — in more than 20 cities — they believe that the Trump administration might want to disappear this data down a memory hole. So these hackers, scientists, and students are collecting it to save outside government servers.