Atmospheric carbon dioxide levels have been much higher than today's levels, with no adverse effects.
But don't let facts interfere with your global warming wet dreams.
Instead of recycling paper, send it straight to landfills.
Paper is not made out of old growth forests. It is made from trees planted as a crop, like wheat or cotton, but to make lumber and paper. If you recycle it, less new paper is made, so less trees are planted. If you send it straight to a landfill, all of the carbon in the paper is removed from the atmosphere and new trees are planted, removing more carbon from the atmosphere.
Atmospheric carbon dioxide levels have been much higher than today's levels, with no adverse effects.
But don't let facts interfere with your global warming wet dreams.