New paper in Nature finds increased CO2 & warming both enhance plant growing seasons

The Hockey Schtick
A paper published today in Nature finds that elevated CO2 in combination with warming further lengthens plant growing seasons, by helping to "conserve water, which enabled most species to remain active longer." In other words, increased CO2 and warming both independently and in combination improve the length and magnitude of plant productivity cycles, a win-win for the biosphere, and a truism well-known by greenhouse operators for a long time. 

According to the authors, "Our results suggest that a longer growing season, especially in years or biomes where water is a limiting factor, is not due to warming alone, but also to higher atmospheric CO2 concentrations that extend the active period of plant annual life cycles."

The biosphere needs more CO2, not less."