Climate models have shown an overall increase in atmospheric humidity as the planet warms. However, there have been several regions over recent years that show a decrease in humidity (Simpson et al. 2024; McKinnon et al 2021). Our study aims to find the basis for these areas of decreasing humidity, by examining plant behavior in the Community Earth System Model (CESM). We utilized 2 components of the CESM, the Community Atmosphere Model and the Community Land Model. For this project, the climate model was run by Drs. Claire Zarakas and Abigail Swann of the University of Washington, as a part of a study in progress.