"kim" wrote in
ups.com:

there are many theors about global warming but one thing is for
certain. we need to cut down on the toxic emisions we produce
especialy co2, and we need to stop cutting down the trees which
help us change co2 into oxygen by photosinthisis


Eh.

Carbon dioxide comprises only about 0.03% of the atmosphere, and an
increase of 10% adds not much at all. Not much at all when you look
at another greenhouse gas, water vapor, which is generally 4-5% of
the atmosphere, fluctuates on a seasonal and daily basis and nobody
is worried about. As far as trees are concerned, only about 20% of
photosynthesis occurs on land, the ocean is a much more important
site for photosynthesis.

Sean