Humans have been growing exponentially in population, taking up space that would otherwise have been inhabited by wildlife. The amount of land untouched by humans has decreased. EO Wilson proposed a concept where half of the earth is set aside as a nature reserve. This could be the answer to many problems, argues EMILY FOLK
If trends continue the world’s great apes are doomed to extinction. But one unique rehabilitation project in West Africa is challenging this bleak picture. Beatrice Newbery reports