Saguaro National Park receives about 10 inches of rain a year, but has some of the highest biodiversity in North American. Learn how plants and animals are adapted to a hot and dry environment.
The axolotl lives in only one place outside captivity: the waters of Lake Xochimilco, in Mexico City. Now, a team of scientists is working to secure its future by looking to its past.
Mary Reynolds of Ireland is building a movement to turn gardeners into guardians of the planet by returning our own patch of land to nature, and by restoring hope that individual action can create lasting change.