Yes,inject the awful stuff into green houses. plants love the stuff.
Plants grow better with higher CO2 concentrations, but for the planet more plants means a lower albedo, which is a positive (warming) feedback.
Well plants like warmer too. AGW theory will shifting Canada/Siberia ever so slightly from an arctic to tropical clime.
Not all plants like warmer conditions, especially those near the equator, some of whom are already near their limits of heat stress... and a warmer world changes precipitation patterns, which can have a big impact on plants. There is not a simplistic relationship between CO2 and plants.
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