Are humans contributing only 3% of CO2 in the atmosphere?, page-6

"At which point?"

You might at least view your own link. He clearly hasn't any depth in his knowledge, or else he is just an actor reading a script. And if you didn't notice the error at 4.21, I suggest you are probably missing a lot from many other articles.

So it isn't surprising that you've missed a lot of other data in your simplistic assertions. For instance, CO2 levels rose 50% from their all time lows of 180ppm 18,000 years ago by the end of the ice age:



http://www.geocraft.com/WVFossils/last_50k_yrs.html

The scary thing from that chart is that the earth was only 20-30ppm of CO2 from a potential total wipeout of plant life on land:

http://onlinelibrary.wiley.com/stor...co&s=cb7da81d4a024d268ae101be91f6caa6c3a1efa0

Fortunately a completely non-manmade event occurred resulting in higher temperatures, which resulted in increased CO2 levels. From that article you can see that optimum levels for photosynthesis occur at the 500ppm mark.

Yes, I meant "we the planet" rather than we as humans - but the premise still applies - CO2 levels have been a minimum of 20 times hat they are today, and the earth, instead of frying, was abundant with life.