New York Times: Years of drier conditions in the Congo River basin in central Africa appear to be affecting trees in the regions vast rain forests, scientists reported on Wednesday. Writing in the journal Nature, the researchers said that the capacity of the trees to photosynthesize had declined, and suggested that if this trend continues, the long-term result could be changes in the structure and composition of the regions forests, the largest expanse of rain forest in the world after the Amazon. Those potential...