Nasa’s output of climate change information aimed at the public has dwindled under the Trump administration, with a former employee claiming “fear and anxiety” within the agency has led to an online retreat from the issue. Laura Tenenbaum, a former science communicator for Nasa, said she was warned off using the term “global warming” on social media and restricted in speaking to the media due to her focus on climate change. “Nasa’s talking point is that it’s business as usual, but that’s not true,” said Tenenbaum, who departed Nasa in October after a decade at the space agency. “They have...