The FTSE Environmental Opportunities Index Series measures the performance of globalcompanies that have significant involvement in environmental business activities as defined bythe FTSE Environmental Markets Classification System (EMCS). These include Renewable &Alternative Energy, Energy Efficiency, Water Infrastructure and Technology, Waste Management& Technologies, Pollution Control, Environmental Support Services, and Food, Agriculture &Forestry. Forming part of the overall FTSE Environmental Markets Index Series, the FTSEEnvironmental Opportunities Index Series requires companies to have at least 20% of theirbusiness derived from environmental markets and technologies (as opposed to at least 50% forthe FTSE Environmental Technology Index Series).