General

Out of curiosity, are you in 9th grade?

I think all of you forget to mention that trees use up the most amount of CO2 when they're [b]growing[/b].
Old forest doesn't just mean "dying trees". Some trees can last for thousands of years.

I would like to know the answer too but my English is too crappy to understand that Patrick's text. Can someone simplify it to me ?

That person seems smart and just took a lot of his time to help answer your question.