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On Friday, Lewis Ziska, a climate scientist who specializes in plant physiology, left his job at the US Department of Agriculture after more than 20 years. On Monday, Helena Bottemiller Evich, a food and agriculture reporter at Politico, explained why. Ziska had worked on a groundbreaking study that found rising atmospheric levels of carbon dioxide are causing rice to lose nutrients—a potential disaster for the 600 million people worldwide who rely on rice as a staple. Science Advances, the journal that published the study, expected that it would attract widespread interest, and advised its authors to prepare resources for the media. The Department of Agriculture refused. Officials spiked a press release promoting Ziska’s work, and asked the University of Washington, a collaborator on the paper, not to promote it either. CNN requested an interview with Ziska. Agriculture’s press office said no. That was a first, Ziska said.
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