Living forests are an important part of the earth’s climate system. But what’s the man-made forest? A man-made forest is exactly what it sounds like – a forest that didn’t naturally occur, but was planted by humans in order to create a new forest or replenish an existing one. While Changa Manga Jungle in Pakistan is widely known as the oldest hand-planted forest, Saihanba in China is the world’s largest man-made forest. Known as the “Great Green Wall,” the forest was planted to stop desertification and fight climate change. Spread over more than 500,000 sq km in the north of Beijing, it acts like an environmental shield and protects north China from sandstorms.