But also the wood that was removed, and that was not intended as fire wood, will eventually end its existance somewhere on a fire stake. Or it will be composted - with the same result. Water vapor is often not mentioned in discussions about Global Warming, because it is not clear whether the amounts are currently rising or falling. And because it's such a potent greenhouse gas, this would reinforce global warming. But perhaps we'll also have to be prepared for a primary effect.
Forests are of great importance to the global water household.
In Holland we know how just a little deforestation in the Alps can cause major problems in our Low Lands. Plants are specialized in evaporation of water, and in so doing, they will for instance make a dry season less extreme, by keeping air humidity up. When the forest is gone, and certainly when agriculture did not take its place, water will wash much faster to the sea. Apart from floods in the river basin, it also means that the local climate will become dryer. This could disrupt a climate system, and by the extent of deforestation alone, it will be noticeable on a global scale.