1 Abrupt Sunlight Reduction Scenarios as a Risk to Global Food Security How can we avoid a global famine if Earth's surface is suddenly receiving significantly less sunlight? The main mechanisms to cause such a reduction of sunlight are either nuclear war (Coupe et al., 2019; Toon et al., 2008), asteroid/comet impacts (C. R. Chapman & Morrison, 1994; Tabor et al., 2020) or large volcanic eruptions (Rampino, 2002; Rougier et al., 2018).