Desalination: A Growing Solution to Water Scarcity

Wed Apr 01 2026 16:29:03 GMT+0000 (Coordinated Universal Time)

As climate change exacerbates water shortages globally, desalination is emerging as a vital solution. With over 20,000 plants worldwide, the industry is rapidly expanding to meet the freshwater demands of drought-affected regions.

Desalination, the process of converting seawater into freshwater, offers hope amid intensifying droughts driven by climate change. With more than 20,000 desalination plants operational globally, the technology is particularly crucial in water-scarce regions such as the Middle East, parts of Africa, and coastal areas in the U.S. However, concerns over its environmental impact—such as carbon emissions and harm to marine ecosystems—highlight the need for sustainable practices and alternative solutions like water recycling.

As climate change intensifies droughts and disrupts rainfall patterns, the world is increasingly looking to desalination as a solution for freshwater. This process entails the removal of salt from seawater, making it drinkable. Currently, desalination provides water to hundreds of millions globally—from the Middle East to the United States—responding to an escalating demand for freshwater resources.

How It Works: Most modern desalination facilities utilize a technique called reverse osmosis, which involves forcing seawater through a semi-permeable membrane that filters out salts and impurities. The resulting product is freshwater, while saltier brine is produced as waste. Furthermore, the seawater is pre-treated to remove contaminants, and the desalinated water is often enriched with minerals to meet health standards.

Another method, thermal desalination, evaporates seawater and then condenses the vapor, leaving the salt behind. Though still in use, this approach is generally more energy-intensive than reverse osmosis.

Usage Trends

Desalination is increasingly relied upon in areas ravaged by water shortages. Notably, over 85% of drinking water in countries like Kuwait and Oman stems from desalination. In the U.S., especially in drought-prone areas like California and Texas, reliance on seawater conversion is growing. Currently, more than 20,000 desalination facilities are operating worldwide, expanding at an annual rate of about 7% since 2010.

Environmental Concerns

Despite its benefits, desalination poses significant environmental challenges. The process generates substantial carbon emissions—between 500 to 850 million tons annually, nearing the emissions of the global aviation sector. Additionally, the brine byproduct can severely impact marine ecosystems by raising salinity levels and introducing harmful substances into the ocean. The intake systems can also trap marine life, which affects the food chain.

Moving Forward

Efforts are underway to make desalination more sustainable by harnessing renewable energy and creating more efficient membrane technologies. Alternatively, experts advocate prioritizing water recycling and conservation, which are generally less energy-intensive and can significantly lessen the environmental impact compared to seawater desalination.

Follow Annika Hammerschlag on Instagram @ahammergram.