The United Nations has warned that nearly half of the global population could face severe water stress by 2030. To combat this, technologies such as cloud seeding are being developed to increase rainfall. The United Arab Emirates, a country with no natural water sources except rain, has been using this technology to increase rainfall by up to 20% over the past decade. The process involves firing flares loaded with salt particles into selected clouds to stimulate rainfall. The UAE government is investing $1.5 million over three years into research to improve rainfall, including a project using nanotechnology to enhance cloud processing materials.