What would optimal vegetation do when confronted with steadily increasing atmospheric CO2

Michael L Roderick, The Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, Randall J Donohue, CSIRO Land and Water Canberra, Land and Water Flagship, Canberra, Australia, Yuting Yang, CSIRO Land and Water Canberra, Land and Water Flagship, Canberra, ACT, Australia, Tim Mc Vicar, CSIRO Land and Water Canberra, Canberra, ACT, Australia and Graham D Farquhar, Australian National University, Canberra, ACT, Australia