Trees are struggling to sequester heat-trapping carbon dioxide (CO2) in warmer, drier climates, meaning that they may no longer serve as a solution for offsetting humanity's carbon footprint as the planet continues to warm, according to a new study led by Penn State researchers.
The actual paper is saying they don’t know if it’s any different from the past or if it will be different in the future. It says literally nothing about trees “struggling to breathe”.