We found that carbon dioxide levels expected by the end of the century should increase plant biomass globally by about one eighth—12 percent or so. The extra 120 billion metric tons of wood are more th
paper in Nature Climate Change that helps answer this question. In our study, we analyzed data from more than 100 large-scale field experiments around the world where scientists grew plants in a high-CO2 environment. The experiments don’t simulate the effects of climate change. Instead they test how plants respond to additional CO2 in the air as a plant food—the building block for photosynthesis.