---
abstract: 'Recent large surveys have found a reversal of the star formation rate (SFR)-density relation at $z$=1 from that at $z$=0 (e.g. Elbaz et al.; Cooper et al.), while the sign of the slope of the color-density relation remains unchanged (e.g. Cucciati et al.; Quadri et al.). We use state-of-the-art adaptive mesh refinement cosmological hydrodynamic simulations of a 21$\times$24$\times$20 $h^{-3}$ Mpc$^3$ region centered on a cluster to examine the SFR-density and color-density relations of galaxies at $z$=0 and $z$=1. The local environmental density is defined by the dark matter mass in spheres of radius 1 $h^{-1}$ Mpc, and we probe two decades of environmental densities. Our simulations produce a large increase of SFR with density at z=1, as in the observations of Elbaz et al. We also find a significant evolution to z=0, where the SFR-density relation is much flatter. The color-density relation in our simulations is consistent from $z$=1 to $z$=0, in agreement with observations. We find that the increase in the median SFR with local density at $z$=1 is due to a growing population of star-forming galaxies in higher-density environments. At $z$=0 and $z$=1 both the SFR and cold gas mass are tightly correlated with the galaxy 