re: True or False: climate change

Are you referring to this portion from your link?

quote:

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96% of CO2 emissions are from natural sources, only 4% is man-made

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I just want to be absolutely clear this is the specific part you were referring to before I address it. (Which won't be until later, it's leg day again!)

EDIT: Actually I might get banned so I'll do a BLUF and then expound more later: Salby is 100% correct! Unfortunately you asked me what percentage of concentration we're responsible for and Salby is talking about emissions.

Nature is responsible for way more CO2 emission than we are. But nature is also responsible for way more CO2 uptake than we are (which is basically none).



Salby doesn't mention natural uptake because he wants to mislead you by relying on the gross and not the net. This is how we can be responsible for only a tiny fraction of the emissions, but pretty much all of the increase in concentration; in the absence of human emissions the CO2 flux would be slightly negative and CO2 concentration would be (very very slowly) falling per the glaciation cycle.