eric: rachel carson's work led to a near-global ban on ddt, but since then other potent chemicals haveere is a smoking gun, some suspect it's a popular type of pesticide called neonicotinoids. now, in 2018 the eu brought in a near-total ban across europe, but they're still in use in australia. and the trump administration has overturned a ban to ensure their continued use in the us. some scientists believe that's bad news fobees. hans: these neonics are usually broken down quite rapidly when they're out in the air, but then when they're in the soil or in the soil water or in surface water, they can hang around for a long time. probably in very low concentrations, but these low concentrations really affect insect life. so, it's a very special class, extremely poisonous for insects, and there's more and more evidence that they are really affecting non-target insect species. ♪♪♪ ♪♪♪ eric: so, what can be done to prevent a silent spring? i'm heading down to southern germany to see how an entire state is mobilizing. ♪♪♪ [bells chiming] eric: bavaria is usually thought of as the heartland of