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Even the trees eventually die, and are decomposed.
It's more of looking at it another way I guess, and different trees should sequester carbon differently.
There is one thing though, the faster growing woods will make bad planks (bending) and so furniture, if I remember right. So there might be a higher probability that it will be used as fuel?
Did nobody look at the numbers?"I know 1 mature tree can store 48 lbs CO2 per year and give 260 lbs O2 per tree per year "The big problem there is that 260 is bigger than 48.
If it's lost as leaves then they decay and take up the equivalent amount of oxygen anyway.
Quote from: Bored chemist on 04/01/2014 12:24:57Did nobody look at the numbers?"I know 1 mature tree can store 48 lbs CO2 per year and give 260 lbs O2 per tree per year "The big problem there is that 260 is bigger than 48.See my first reply.I assume the author meant that the tree stores about 48 pounds of carbon.And releases 260 lbs of oxygen.
"Somewhere between 500-600 liters of oxygen (at 1 atm pressure) a day. That may sound like a lot, but there are only 1.42 grams of oxygen/liter at 0C, 1ATM. So that's only 710-852g/day. Or, a pound and a half to just under two pounds/day." is one answer
Or just over 1 kg of CO2 exhaled per day per human. Multiply by 9 x 10^9 and you find that humans contribute a massive 10 megatonnes of carbon dioxide to global warming (or is it climate change these days) every day even if they don't use fossil fuels. Shocking, isn't it?
But this is not 'new' CO2 is it.
I'm sure that you wouldn't want to give the impression that just through respiration, humans (or any other animals for that matter) cause an inherent increase in the amount of 'free' CO2 in the atmosphere (and ecosystem as whole), would you?
Increased numbers of humans are in no way directly, by breathing, putting any more CO2 into the system.
A tree releasing 226 liters, more or less, of oxygen, with a human consuming 5-600 liters that same day. Using that it seems to need two trees per human, per day? Could be my conversions, it was late, but, I don't think it is.
So, to a fairly good approximation the reaction you need isn CO2 + n H2O --> (CH2O)n + n O2each molecule of CO2 produces 1 molecule of oxygenSo 44 grams gives 32 grams48 pounds gives 35 pounds