Where did you read that? Sounds highly improbable...

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More Carbon Dioxide in the atmosphere is not necessarily good for plants.

http://www.skepticalscience.com/co2-plant-food.htm

Keep serving up the same old statements from AGW push the old AGW CO2 bandwagon gangs...
I for one have switched off long ago from that same old same old band wagon.
Bring out the proof of CO2 positive feedbacks exceeding negative feedbacks and some one may listen
and not hit the "ignoring this user button". I only have a brief look once in a while for mild interest
to see if you put up anything new, but sadly almost all the time, no same old links and posts.
Sorry, it has become a bit boring really mate for me anyway!
Find a few new things please to spark our interest.