I hate it when that happens: Small amounts of additional CO2 allegedly cause pinyon pines to be starved of CO2

Will pinyons be next to fall?

Although this reluctant growth has allowed pinyons to thrive in the arid Southwest for millennia, today the trees are vanishing from the landscape. A decade of drought, which scientists said is a direct result of climate change, has allowed bark beetles to feast on Southwest forests and left pinyons vulnerable to catastrophic wildfires....despite the recent wet winter, the Southwest is still firmly in the midst of a drought.
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In a drought, a pinyon tree will close off its pores to conserve water and try to ride it out. However, the pores are also necessary for it to breathe in carbon dioxide, and it starves itself waiting for rain.