
His professional interests include climate change and variability, carbon cycle and ecosystem, carbon sequestration and other technical solutions and policy implications of climate change. He is a Clarivate Highly Cited Researcher and on Reuters Hot List of Top Climate Scientists. He is a founding co-chief editor of the journal Earth System Dynamics. He was Chair of the 9th International CO2 Conference. He is a contributor to the Intergovernmental Panel on Climate Change (IPCC) Reports and the Global Carbon Project. He served on the US CLIVAR panel and the US Carbon Cycle Science Working Group.
