It represents a two-way street, where policymakers must understand and 330 POLICY IMPLICATIONS FOR THE 1990S AND BEYOND.CloseWhere the Conflict Really Lies: Science, Religion, and Naturalism (2011) by Alvin PlantingaOne possibility is that conservation is a matter of sustaining a substance in existence, while concurrence is a matter ofconserving a particular causal powerin the conserved substance.