[JKD01]

Lozimka kaže:

http://www.businessspectator.com.au/...co2-we-thought

About 50 per cent of all CO2 taken in by photosynthesis goes back to the atmosphere soon after through plant respiration.

Of what remains, more than 90 per cent also returns back to the atmosphere through microbial decomposition in the soils and disturbances such as fire over the following months to years – what stays, is the land sink.

Dakle, ipak drveće zadrži više CO2 nego što ispusti.
Drveće u kratkom roku ispusti oko 50% CO2 u odnosu na kisik koji proizvede danju a od preostalih 50%, oko 90% ispusti nakon svoje smrti. Sav taj CO2 je "uskladišten" u deblu, jer kao i sve živo, ono je izgrađeno od ugljika.
Znači odnos povrata CO2 nazad u atmosferu je +/-95% u odnosu na proizvedeni kisik.

http://www.newton.dep.anl.gov/askasc...1/gen01854.htm

ALL the oxygen in the atmosphere is the result of plants producing far more oxygen than they need!

http://scienceline.ucsb.edu/getkey.php?key=2860

plants produce approximately ten times more oxygen during the day that what they consume at night.

http://upload.wikimedia.org/wikipedi...iagram.svg.png

http://scienceline.ucsb.edu/getkey.php?key=826

How much carbon dioxide do plants give off?


During their lifetimes, plants generally give off about half of the carbon dioxide (CO2), that they absorb, although this varies a great deal between different kinds of plants. Once they die, almost all of the carbon that they stored up in their bodies is released again into the atmosphere.

Gledajući sve ove linkove, kao i još mnogo drugih, ipak smo u laganom plusu što se tiče omjera recikliranog CO2 i njegovog povratka u atmosferu.
Naravno da to nije konačno rješenje problema prekomjerne količine CO2 u zraku uzrokovane ljudskim aktivnostima, treba gledati kako smanjiti čovjekov utjecaj na prirodu, ali teoretski, povećanje volumena šumskih površina bi moglo donekle dodatno ublažiti povećanje CO2.