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We are also made of the same stuff poop is made of.
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Yep, and we are also releasing the carbon that the tree absorbed from the atmosphere during it's lifetime back into the atmosphere. 
When the tree was alive it captured the CO2 from the atmosphere, used the carbon as it's own ‘building blocks’ and released the oxygen atoms back into the atmosphere. When we burn it it's like reversing that process. >

We're made of the same stuff stars are made out of. In a way, we are the sun.