What part do humans play on ecosystems? What part do ecosystems play on humans? Population Impact focuses on populations—of humans, plants, and other animals—and regional and global ecosystems: how they are endlessly connected, and how they are affected by human decisions on the use of resources. Explore the current topics of human population growth, tree cloning, biodiversity, and more through specimens, photographs, text, and graphic elements, with a special focus on the research being done by Carnegie Museum of Natural History scientists.