Appearing with the statement is a symbol denoting primary use or appeal: YA, for those books of
general YA interest; YA / C, for books of curriculum use; YA / S, for books that will appeal most to teens with a special interest in a specific subject; and YA / M, for books most suitable for mature young adult
readers of any age capable of adult judgment and able to
respond to the book as a whole rather than reacting to isolated parts or incidental aspects.
Indeed however, as your post nicely illuminates for our
readers, there are a more
general set of questions dealing with the complex issue of how vegetation will
respond not just to CO2 changes, but to the climate changes themselves that may result from the associated radiative forcing.