If you want to see how plants fared during the ice age--and how they might fare in the year 2050--enter the ARS "time machine" in Temple, Texas, in the Blackland Prairie.
During the ice age, Earth's atmospheric carbon dioxide level was roughly half of today's and one-third of that projected for 2050. How will the plants we depend on for survival respond to the future higher [CO.sub.2] levels?
Tunneling Back to the [CO.sub.2] Future
The "time machine" is more of a time ...