Tree ring researchers use a metal increment borer to extract a pencil-thin sample from the tree, extending from the newest rings at the bark to the oldest rings at the center. The process does not cause permanent injury to the tree. Photo by Nicole Davi
Tags:
The first Earth Day in 1970 ignited a movement to stop polluting our planet. Today, our scientists and experts are tackling the most pressing challenges to achieve real-world impact. This Earth Day, join us in our commitment to realizing a just and sustainable future for our planet. Visit our Earth Day website for ideas, resources, and inspiration.