AmazonFACE: Assessing the effects of increased atmospheric CO2 on the ecology and resilience of the Amazon forest 2025-2030 Science PlanThe AmazonFACE Programme is directed toward resolving a key source of uncertainty about the future of the Amazon forest: the potential for rising atmospheric CO2 concentrations and to preserve tropical forests against the deleterious effects of climate change by stimulating forest growth and resilience to drought. The core task of AmazonFACE is a CO2 enrichment experiment of unprecedented scope and importance, conducted in a primary, old-growth forest in central Amazon. The experiment will simulate the future atmospheric CO2 composition in order to attempt to answer the question: “How will rising atmospheric CO2 affect the resilience of the Amazon forest, the biodiversity it harbours, and the ecosystem services it provides?”