The U.S. Navy has developed a method for extracting what from seawater?

In a process that extracts carbon dioxide and hydrogen gas from seawater to create hydrocarbon fuel, the U.S. Navy claims this technology will allow ships to subsist completely on fuel derived from this method within 10 years. Today, the Navy depends on a fleet of 15 oil tankers and land-based depots for refueling. This technology will make the Navy less vulnerable when operating on long-range missions, according to experts.