pIn this edition we head to Gansu Province, an arid region of China which borders Mongolia. Here, in the vast expanse of the Gobi desert, China is going full steam ahead on solar energy. The world's biggest polluter is aiming to produce a whopping 20 of its renewable energy by 2030. pbr As Pierre-Philippe Berson reports, China is already the world's largest manufacturer of solar panels and is now set to become the biggest producer of solar energy.