The percentages ARE insignificant when compared to how much CO2 is naturally pumped into the atmosphere.
According to CO2now.org

as of 2010 humans emitted 36.7 Billion Metric Tonnes of CO2 into the atmosphere. Which wow...that seems like a whole lot of CO2 coming from humans until you understand that's only 3.5% of what is naturally going into the atmosphere already which is (correct me if my math is wrong, I know you will)
1011.87 Billion Metric Tonnes of CO2. In total 1048.57 Billion Metric Tonnes of CO2 is 0.003 to 0.004% of our atmosphere. Meaning our atmosphere has 34952333.33 to 26214250 Billion Metric Tonnes of other gases in the atmosphere (using their percentages and numbers to calculate).
There's kind of a reason the graph of Earth's atmosphere goes from Nitrogen to Oxygen to Argon to
TRACE gases. Trace - noun: a very small quantity, especially one too small to be accurately measured
But CO2 a "trace" gas in the Earth's atmosphere is going to destroy us all rather than the regular natural ups and downs of Earth's climate which has had this very planet see unreasonable warm and unbearably cold temperatures well before anyone had ever even thought of the SUV.
But I digress, you're the man with the knowledge, you're the scientist, so I reckon we're all doomed to be burned and or frozen to death from our unholy excesses which have angered our Mother Earth.
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