Gem Castillo Keywords natural resources Environmental economics wealth accounting and valuation of ecosystem services economics of environmental governance forest land use planning economics of coastal resources management payment for environmental services PES Economics and Environment Center for Studies Read more about Gem Castillo Gem Castillo is currently the President and Chairman of the Board of the Resources, Economics and Environment Center for Studies (REECS). He is also concurrently the President of the Resources and Environmental Economics Foundation of the Philippines (REAP) and the National Director of the Economy and Environment Group Philippines (EEG), the country institution partner of the Economy and Environment Partnership in Southeast Asia.