Concern for the status of the Amazon rainforest usually centers on understanding the extent of deforestation and its devastating consequences. But this may only be part of the story. The authors of a new review article, published in the journal Science, say that about 2.5 million square kilometers of the Amazon (that is almost 40 percent of remaining rainforest), is degraded by the impacts of human activities.  The review used data from previously published scientific studies and satellite imagery to identify the changes in the Amazon region...