AoB PLANTS CO2 stimulation of photosynthesis in Liquidambar styraciflua is not sustained during a 12-year field experiment Atmospheric carbon dioxide levels have increased by ~ 25% over the last 50 years. While more carbon dioxide can initially stimulate plant photosynthesis, in a new study published in AoB PLANTS, Warren et al. found that... AoBPLANTSJanuary 27, 2015