Slows Coastal Erosion
Following the Indian Ocean tsunami of 2004, a study led by Danish ecologist Finn Danielsen reported that coastal areas flush with mangrove trees were markedly less damaged than those without. The findings suggest that the trees shield the coastline (pdf) by reducing the height and energy of ocean waves and offer hard evidence that deforestation could result in increased coastal damage from storms.
Mangroves are expert carbon scrubbers. A global inventory by McGill University environmental scientist Gail Chmura found that mangroves pack away carbon faster than terrestrial forests. Every year they hoard some 42 million tons, roughly equivalent to the annual carbon emissions of 25 million cars.
Establishes Deep Roots
The mangrove depends on its complex root system for stability, oxygen, and salt filtration. In 2007 U.S. Geological Survey scientists analyzing mangrove roots and soil up to 8,000 years old found that during periods of rising sea level, the roots grow faster and bolster the soil, which helps hoist the tree upward.
Survives Extreme Heat
Mangroves love sunshine. Unlike many tropical plants that close the pores on their leaves at midday to reduce sun exposure, mangroves remain active, absorbing heat to prevent evaporation of the shallow waters they depend on. They also curb their thirst: A 30-foot mangrove sips about six gallons per day, while a similar-size pine tree guzzles more than three times that amount.