Did you know the Sahara Desert was once a lush, green landscape? In Northern Chad’s Ennedi Massif, archaeologist Mahamat Ahmat Oumar is leading a groundbreaking mission to preserve prehistoric rock art that reveals this forgotten past. It’s a battle against time to save this ancient heritage from wind, weather and vandalism. Today, the Sahara is once more feeling the impact of climate change. This arid region has seen unusually heavy rainfall in recent times. A challenge for communities there. Could the desert become green again?