Invasive aquatic pest turned to fuel in flood-hit South Sudan

It may be an invasive pest, known for choking waterways in many parts of the world, but water hyacinth is proving an unlikely source of fuel in flood-stricken South Sudan. The fast-growing aquatic weed is rich in biomass, organic material that produces energy, and is being harvested and turned into briquettes for use in heating and cooking. As a fuel, it's cheaper than wood-based charcoal and safer to collect than firewood.