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Global Warming. Part 3 - Man-made or natural? (2of2)

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Global Warming. Part 3 - Man-made or natural (2of2). This video is the part of PBS documentary "Global Warming. What's Up With The Weather?" http://www.pbs.org/wgbh/war... .  
 
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seaplaneguy1 (4 weeks ago) Show Hide
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Permanent CO2??? NONsense!!!. CO2 has been up to 550 ppm at least three times in the last 180 years. It goes up and down every 70 years. We are in an up trend from 1950's to now. In 1940's it was over 450 ppm, then dropped. Permanent...insanity of corrupt pols and "scientists" out for gov grants in a PC world. ICE core data is not valid...open celled...only 80 year average...CO2 goes up and down from 300-550 ppm in 70 years, therefore will always be 260-280 as it leaks out... Wake up.
wanker4761 (3 months ago) Show Hide
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liberal rubbish
moronpoliticsdotcom (5 months ago) Show Hide
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it improves plant growth. I don't like this use of the word, but people prefer a word to a phrase. Have a word for "plant growth accelerant"?
starrdreams (4 months ago) Show Hide
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For plants it is good. Till certain amount.
aacidpencils (5 months ago) Show Hide
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uuugghhh! Carbon Dioxide is not a 'fertilizer.' Yes, its needed for plant growth in balanced amounts, but too much Co2 causes the plants to grow larger (as stated) and become less nutrient dense. Dandilions growing beside the roads are larger, yet much less nutritious and much higher in heavy metals to the point that they are no longer healthy to consume in these areas.

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