I remember in Jr hs my biology teacher explaining to us young skulls full of mush how plants and trees need CO to survive. Trees are good they told us. Trees help negate the effects of gloBULL warming they told us. Trees are esthetically pleasing they told us. And the crops needed to alleviate world starvation (and support a vegan diet) need CO to survive they told us. Trust the science they told us. Now CO is bad? Were we lied to?