USDA: “Shrubs far outgrew native grasses in Colorado rangeland when exposed to elevated levels of carbon dioxide (CO2), according to a study published by Agricultural Research Service (ARS) scientists and cooperators at Colorado State University. The results suggest that rising CO2 levels in the Earth’s atmosphere may be contributing to shifts in plant community dynamics, in which woody vegetation is favored over perennial forage grasses. The study will be published in this week’s online edition of the Proceedings of the National Academy of Sciences.”