In March 2012, I participated in a study tour to the island of Bohol, near the unique Danajon double barrier reef ecosystem – the only one of its kind in the Philippines and one of only three in the Indian and Pacific Oceans. Nowhere is the connection between population dynamics and biodiversity more evident than in the Philippines, one of the most densely-populated countries on the planet, with more than 300 people per square kilometer. Nearly every major species of fish in the region shows signs of overfishing, according to the World Bank.