(CNN) — The world’s trees are in critical danger, with a staggering number of tree species teetering on the brink of extinction, according to a new global analysis released Monday. The decade-long ...

In an alarming development for conservationists, nature lovers – and anyone who likes to breathe oxygen – a recent report has revealed that almost 40% of the world’s trees are at risk of extinction.

Trees have long been appreciated for adding beauty, shade and a sense of refuge to our cities. Urban street trees offer a host of ecological benefits, too: combating the heat island effect and ...