When it comes to amounts of rainforest, the issue is quite divisive. On the one hand, it is a known, and undisputed fact that rainforests, by percentage, are an ever dwindling resource. On the other hand, the amount of involvement by man, whilst generally quite large, is subject to disagreement. Why so?
Take for instance the issue of deforestation. It is generally accepted that deforestation has a direct bearing on the amount of rainforests that exist, and rightly so. However, what about climate change? Rainforests rely on abundant moisture in order to exist, and changing weather patterns are playing havoc with those pattern. Of course, some would argue that climate change is cyclical, albeit exacerbated by man's intervention. However, others would say that without man, the climates would be relatively stable..thus leading to stable levels of rainforest cover around the World.
Whatever the case is, rainforests by percentage, are a very small resource, and must be protected from further destruction.