The American chestnut tree, once a significant part of eastern US forests, has been decimated by a fungus, with only a few wild specimens remaining. The American Chestnut Foundation is working on resurrecting the tree through hybrids with resistant species and genetic modification. However, the project faces challenges and a complex genetic phenomenon of resistance. The foundation also faces the challenge of reintroducing the tree into an altered landscape due to climate change and other factors. The revival of the American chestnut is predicted to take decades or even centuries.