ANTHONY WATTS: Climate Craziness of the Week – AGW could trigger plants and soil in tipping point attack. “Yes, somehow, more plants growing due to increased CO2 will cause more carbon dioxide in a vicious cycle. Notice three things about this study: 1. The word ‘could’ 2. ‘modeling work’. 3. Lack of any paleo reference to such an event in Earth’s past during higher periods of CO2.”

Related: Look out, a soil model says more plants means massive carbon stores might be freed.

Note the politically-correct permitted phrasing . . . :

Although a greenhouse gas and pollutant, carbon dioxide also supports plant growth.

So after 500 million years of evolution of carbon based life-forms, carbon dioxide is first and foremost a greenhouse gas, secondly it’s a pollutant, but but… it does… “support” plant growth.