Readers reply: Are there places on Earth where humans haven’t been?

The long-running series in which readers answer other readers’ questions takes a deep dive into the unknown and untrodden ...

Sahara vs Great Green Wall: An 8,000-km green belt is being built across Africa's Sahel region; aims to stop desert expansion

Africa's Great Green Wall is an 8,000-kilometre restoration initiative stretching from Senegal to Djibouti, aimed at ...

After the Great Wall of China, Africa is building an 8,000-km 'Wall of Trees' to fight climate change, restore land and feed millions

Stretching from the Atlantic coast of Senegal to the shores of Djibouti on the Red Sea, Africa is undertaking one of the most ...