---------- Forwarded message ----------
From: Pat Neuman <npatnew@...
Date: Dec 21, 2007 12:29 PM
Subject: [population-northstar] A link between greenhouse gases and
the evolution of C4 grasses
"How a changing climate can affect ecosystems is an important and
timely question, especially considering the recent global rise in
greenhouse gases. Now, in an article published online on December 20th
in the journal Current Biology, evolutionary biologists provide strong
evidence that changes in global carbon dioxide levels probably had an
important influence on the emergence of a specific group of plants,
termed C4 grasses, which includes major cereal crops, plants used for
biofuels, and species that represent important components of
grasslands across the world."