Trees can grow to become some of the oldest living organisms on our planet. In fact, the average redwood lifespan is around 800 to 1,500 years, with some able to span 2 millenia.

At up to 368 feet (112 meters) and 1,500 years old, redwoods are among the world's tallest and oldest living trees. Researchers are struggling to understand and protect these natural treasures.

Some of California's redwood trees have been growing for thousands ... She would join two other activists, staying in a 1,000-year-old tree named "Luna." The initiative was sponsored by Earth ...