Now that the mangroves are actually getting seriously depleted, people are trying to help them. One of the ways is encasing the mangrove saplings in PVC tubing to provide protection and support until they can get established. Another way is restoring mangroves not through planting, but through engineered site elevations and the removal of dredge spoils. The Florida Government is also protecting some mangrove areas.
http://www.csc.noaa.gov/coastal/expert/natreview/natreview06.htm
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