I'm sure my links aren't going to be relevant if I've misunderstood your argument so badly!

"Now, 150 years after the end of the Little Ice Age and with an extra 6.3 billion people breathing in air, absorbing oxygen, and exhaling carbon, the temperatures and PPM of Carbon are on the rise."

If the exhaling carbon is not significantly affecting the PPM of carbon, wouldn't you have written

"Now, 150 years after the end of the Little Ice Age, the temperatures and PPM of Carbon are on the rise."

What argument did you intend to make if not "6.3 billion people exhaling carbon is contributing to climate change"?