Yep CO2 is a plant's favorite. Problem is that those plants get bigger, have babies, and then, Ta-Da more CO2. Maybe, I dont know, watch the video YOU linked to. Plants are by far the biggest producer but we have disrupted the balance. A hair-trigger balance. And while I'm not going to say I believe we are doomed it must be paid due attention.
Remember what NASA said?
"And as global temperatures rise, scientists say the output of carbon dioxide by plants will accelerate"
Plants do not output more CO2 than they take in. The NASA article says:
"Every year, about half of the 10 billion tons of carbon emitted into the atmosphere from human activities remains temporarily stored, in about equal parts, in the oceans and plants. “While our study did not address the connection between greening and carbon storage in plants, other studies have reported an increasing carbon sink on land since the 1980s, which is entirely consistent with the idea of a greening Earth,”
In other words, about half of man made CO2 gets absorbed by plants. Plants are net carbon sinks, not net carbon producers. The more plants grow, the greater is their capacity to absorb CO2.
But you miss the fundamental point. Global warming = global greening. The Earth is getting hugely greener. That should be a cause for celebration, not despair.
All courtesy of Global Warming.