Overfishing, coastal development, deforestation, and pollution are major environmental problems threatening the Philippines' marine and land environments. Overfishing has led to a 90% drop in some fisheries' catches and costs $420 million annually. Coastal development including infrastructure, aquaculture, and reclamation has damaged coral reefs, mangroves, and seagrasses, reducing mangroves to 36% of historic levels. Deforestation endangers biodiversity as many endemic species depend on forests, which cover only 3% of original area. Poor waste treatment pollutes water sources as only 10% of sewage is treated. Weak enforcement of regulations exacerbates these problems.