According to the property-rights principle: O local communities should have a property right over flora and fauna within their borders. all users of environmental resoruces should be given property rights over those resoruces. all environmental policies should clearly define property rights. all resources should be used in a manner that respects the property rights of future generations.\fWhich of the following is not included in the United Nations Development Program's human development index (HDI)? happiness longevity income O knowledge