Extra CO2 a boon to plants, but only at low temperatures

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Extra CO2 a boon to plants, but only at low temperatures,
Sept. 2, 2015,
By Brooks Hays,
UPI.com,

Phytoplankton are plant-like microorganisms that serve as the foundation for many marine food chains. Like plants, phytoplankton covert sunlight into chemical energy and carbon dioxide into oxygen.