Finding old-growth trees that haven’t been disturbed by human activity often requires hiking, kayaking and camping out for days. The only way into Wrangell St. Elias National Park and Preserve in Alaska was by air. The team had to fly in one by one to take samples along the tree line. 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.