"Findings Cast Doubt on Plant Benefits From Rising CO2"

"Increasing aridity - driven in part by rising temps - makes Yellowstone grasslands less productive despite carbon dioxide's fertilizing benefits."

"BOZEMAN – More than 40 years' of evidence from a mountain meadow shows that increasing carbon dioxide levels don't help plants.

In fact, the opposite is true: Grassland productivity today in one Montana meadow is half of what it was in 1969, when AM ruled the airwaves and atmospheric carbon dioxide concentrations were 327 parts per million, 20 percent lower than today's.

Researchers concluded that increasing aridity in the greater Yellowstone ecosystem countered any gains plants might have enjoyed from the increased carbon dioxide."

The Daily Climate had the story May 22, 2015.