This thesis is composed of three independent essays. In the first chapter, I analyze the effect of a biofuel-favorable policy in the U.S. on fetal health. I show that the policy led to an expansion in the production of corn, a pesticide-intensive crop, and to increased risk of fetal conditions previously associated with exposure to corn pesticides. In the second chapter, I examine the role of agricultural productivity as a mechanism linking rainfall shocks to civil wars in African countries. I show that rainfall over agricultural land and during the growing season has a hump-shaped relationship with agricultural output, which is mirrored by a U-shaped relationship with civil war risk. In the third chapter, I examine the effect of various se...