Addressing the issue of climate change, my research focuses on understanding the nature and variability of past climate. Currently, my research focuses on the San Juan Mountains in southern Colorado. I am using a combination of tree ring and lake sediment climate indicators to reconstruct 1000 to 2000 years of climate history in the region. My research will be part of a bigger project extending from southern Colorado into central Mexico focused on understanding the nature of summer precipitation in the Southwest. This research will provide baseline information on climate variability critical for evaluating and assessing the impacts of climate change on natural resources.