What are the environmental impacts of desalination? Most forms of desalination are energy-intensive. Desalination has the potential to increase fossil fuel dependence, increase greenhouse gas emissions, and exacerbate climate change if renewable energy sources are not used for freshwater production.

In 2026, the biggest problem with desalination remains the environmental impact of brine disposal and its massive energy consumption. For every gallon of fresh water produced, about 1.5 gallons of "brine" (ultra-salty wastewater) is created. This brine is often laden with anti-scaling chemicals and heavy metals; when pumped back into the ocean, it sinks to the seafloor, creating "dead zones" where the high salinity and low oxygen levels kill local marine life. Economically, desalination is still roughly five to ten times more expensive than traditional water recycling or groundwater extraction because it requires an enormous amount of electricity to push water through reverse osmosis membranes. While 2026 has seen the rise of solar-powered desalination plants, the sheer scale required to solve the "Global Water Bankruptcy" crisis means that the carbon footprint and the "toxic salt" byproduct remain significant hurdles for wide-scale adoption in non-coastal or developing regions.