Global climate change is a topic that has garnered much attention in recent decades from both scientific and policy arenas. This article provides a synopsis of the current state of the science, and reviews the challenges of climate change in scientific, policy, and public arenas. Secondly, we provide a review of observed changes in global climate with a more detailed view of climatic changes and their subsequent impacts on terrestrial systems across the American West. We specifically highlight studies published since 2014 that provide current insights to the collection of science on climate change; its impacts on the American West; and complement national and international assessment reports
