The Caucasus is home to all kinds of landscapes - glaciers, forests, deserts, steppes. More than 7,000 species live between the Black Sea and the Caspian Sea. But the region's wild heritage is increasingly under threat. Georgia's forests are desperately in need of reforestation. It's being carried out by environmental group WWF with the help of entire school classes. The idea is that the children won't just be doing something for the environment, but also learning something valuable.