Birds are vanishing from tropical forests. Is another ‘silent spring’ coming?
随着亚马逊及其他地区神秘鸟类数量的减少，科学家怀疑气候变化可能是罪魁祸首
'Nitrogen fixing' trees could help tropical forests bounce back, research suggests
在巴拿马狭窄的地峡，科学家发现向土壤中添加氮可以使树木生长翻倍，为森林恢复提供了新的见解。
