Unhappy1
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The minimum CO2 levels for plant growth is around 200-240 ppm IIRC. We are currently around 400 ppm. Plants can tolerate up to 1500 ppm and numerous studies have reported better plant growth in conditions of 700 ppm. There is evidence to suggest that the earth has been greening the past 30 years and it may very well be due to increased temperatures and increased levels of CO2. So one of the positives that may come from increased CO2 is increased crop yield. Obviously more research is needed and I am not suggesting we should pump more CO2 into the atmosphere to increase crop yields or make the earth more green. Just pointing out one of the possible positive effects of increased CO2 in the atmosphere.
Also, I don't think the rate at which we produce CO2 is sustainable in the long run (we seem to double our CO2 every 30-40 years at current rates). I just don't agree with some alarmists views that we should cripple economies with carbon taxes to "save the planet and ourselves" when it is not entirely clear that our contributions are as bad as they claim.
And of course it would be nice if they get ITER to work.
Im not a botanist but im pretty sure we can supply CO2 to the plants through direct means, that doesn't involve the potential harm of CO2 admissions. Second point - I also dont agree that we should cripple our economies but we can still make educated investments in green energy that wont cripple economies, many of the European models are ones that i greatly admire.