Qatar’s mangroves, or “green fortress,” are making a major comeback, Al Doha News reported. Government efforts over the past three years to plant “nature’s carbon sinks” have led to an increase in the surface area of mangrove swamps to 14k sqm from 9k sqm. Mangroves produce oxygen, protect beaches from erosion, are important for the reproduction of several kinds of fish — and sequester many times more CO2 than do most forests.