The once-majestic oak tree is all but dead: battered by repeated heat waves, it has shut down vital functions to conserve water and is slowly dying in a French forest. It is one of countless trees ...

For the past several years, Penn State geoscientist Sarah Ivory and her students have been among a team of scientists scaling the East African Rwenzori Mountains, collecting sediment core samples from ...

If you notice a substance that looks like ash or soot on your trees, it's likely not the result of a fire. Instead, you're ...