Much of what we thought was true about Amazon rainforests has turned out to be not quite so. As perceptions sharpen, the value of the Amazon ecosystem is becoming more fully appreciated, as are the consequences of converting this forest to other uses. Even though...

Humans rely on healthy forests to supply energy, building materials, and food and to provide services such as storing carbon, hosting biodiversity, and regulating climate. Defining forest health integrates utilitarian and ecosystem measures of forest condition and...