Yemen is suffering from a devastating humanitarian crisis. In the midst of civil war, most people no longer have access to energy and organic waste piles up in the streets. This allows fatal diseases such as cholera to spread easily. Yemeni engineer Omer Badokhon, winner of the United Nations Young Champion of the Earth award, has come up with an idea to face these two challenges: turning organic waste into biogas. Since 2015, a bloody civil war has been ravaging Yemen, the Arab world’s poorest country. It isn’t only bombings that kill thousands of civilians, but also the lack of food and hygiene. Save the Children estimates that around 130 children die every day from extreme hunger and disease. Infectious diseases are spreading at an increasing rate, due to the disrup...