Ecology

A new study indicates that the number of plant and animal species at risk of extinction may be considerably higher than previously thought. A team of researchers, however, believe they’ve come up with a formula that will help paint a more accurate picture.

While some of her friends spent the summer working in retail, Sylvia Pericles, a Staten Island high school student, was ankle-deep in a marsh in Piermont, N.Y. Some days were filled with the hard manual labor of chopping down an invasive reed that was overtaking the wetland.