When people picture ecotourism, they often imagine walking through rainforests dense with vegetation, diving into the deep blue to observe marine wildlife, or hiking mountain trails where each change in elevation reveals a new landscape. These activities may look “eco,” but their impact hinges on how they are planned and...

The world is a remarkable place — from the snowy peak of Mount Everest to the darkest depths of the Mariana Trench, and all the wondrous corners in between. People are drawn to watch elephants roam the Serengeti, learn about forest traditions from communities in the Amazon, and marvel at...