The document discusses black gold (oil) which has powered the United Arab Emirates' economy for decades, but their oil reserves are estimated to last only 93 more years. It then explores options for green gold (biofuels) as a more sustainable alternative energy source after the country's oil runs out. Biofuels can be produced from waste materials through processes like composting, drying, and gasification to produce fuel for use. The UAE has begun research into using waste materials to produce biofuels that could replace oil in the future.