system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Isn't burning firewood more ecofriendly than burning coal or LPG?

The way I understand it the main culprit in climate change is carbon.  By burning coal or LPG we are releasing carbon that was trapped millions of year ago.  But by burning wood we are only releasing carbon that was trapped as little as 5 years ago.  This carbon would again be absorbed by trees and we would have a very short carbon cycle.

The problem would be deforestation.  But that can easily be countered by legislation that says that only approved firewood can be burned as fuel.  And that will result in large swathes of land being used to plant trees which grow fast and result in good quality firewood.  This will also result in biotechnology research that engineers trees that grow faster and burn more efficiently.

There would be investment in optimising planting and harvesting patterns.  As also investment in trapping the smoke.  Instead of venting it through chimneys into the air, it could be trapped in some filters.  Most of what those filters will trap would be ash and there would no doubt be some use that could be found for that.

Or am I way off?
gpt
Yes, burning firewood is more ecofriendly than burning coal or (I think you were going for) Liquid Natural Gas, largely because it's renewable. But it's **energy density** that's the problem. 

A cord of firewood is a certain volume, and a huge part of that cord is empty airspace because firewood doesn't stack exactly perfectly. Further, the wood itself is filled to brimming with air because wood's not that dense. So in addition to harvesting costs and drying wait times, you have massive added transportation costs to get it to the plant where it will be burned. Then you have to add the extra calories that are lost in the combustion process because, even after seasoning, that wood still has a percentage of water content that "steals" heat from the wood's fire in order to evaporate away.

That makes it *way way way* less efficient at generating industrial levels of electricity than coal or LNG, and that outweighs a lot of the ecofriendly argument.