Meehl uses computer models and atmospheric observations to examine both present and future climate change. He is an expert on the likely impacts of global warming on extreme weather events, such as droughts, floods, and heat waves. He also studies naturally-occurring climate processes that produce year-to-year and decade-to-decade variability and examines the resulting interactions with the warming due to increasing greenhouse gases. The impact of the solar cycle on climate patterns on Earth is another research interest. Meehl has served as convening lead author and lead author for scientific assessments by the Intergovernmental Panel on Climate Change (IPCC), which shared the 2007 Nobel Peace Prize. Meehl is a senior scientist in NCAR's Climate and Global Dynamics Division.