This group of articles, which arose from a panel planned for the 2020 annual meeting of members of the Society for Cinema and Media Studies, draws attention to an unpopular but inescapable issue: the adverse environmental effects of streaming media. Four of these brief interventions focus on streaming media's carbon footprint, estimated by some to be 1 percent of global greenhouse gas emissions (The Shift Project 2019). This startling figure is rising at a calamitous rate as more people around the world stream more media at higher bandwidth-now exacerbated by the COVID-19 pandemic. Another factor in streaming media's environmental impact is even less welcome: the deleterious effects of higher levels of electromagnetic frequencies that media corporations' turn to fifth-generation (5G) wireless technology would exacerbate. These effects are well documented yet almost universally ignored. Despite all these findings, the notion abides that digital media are immaterial. Laura U. Marks introduces the research challenges involved in calculating the carbon footprint of streaming media and suggests actions consumers and media makers can take to mitigate this environmental threat. Joseph Clark discusses the implications of digitizing huge amounts of archival film and connects material histories of news film production, distribution, and preservation or disposal to contemporary issues of digital storage, streaming, and energy use, using the newsreel archive as a case study. Jason Livingston's contribution expands on his droll and disturbing video lecture, which presents a speculative app for mobile phones that tracks streaming, correlates it to energy use and CO 2 emissions, and suggests methods to mitigate usage. Denise Oleksijczuk introduces scientific research on the health and environmental impacts of high levels of electromagnetic frequencies and suggests ways, including creative practice, to break through the resistance to these findings among telecommunications companies, governments, and the public. Lucas Hilderbrand focuses on best practices in teaching: how to educate our students Laura U. Marks' most recent book is Hanan al-Cinema: Affections for the Moving Image (MIT, 2015). She programs experimental media art for venues around the world and is the founder of the Small File Media Festival and a founding member of the Substantial Motion Research Network. Marks

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