The fund seeks to provide investment returns that correspond, before fees and expenses, generally to the performance of the Fidelity Clean Energy Index. Normally investing at least 80% of assets in securities included in the Fidelity Clean Energy Index and in depositary receipts representing securities included in the index. The Fidelity Clean Energy Index is designed to reflect the performance of a global universe of companies across the market capitalization spectrum that distribute, produce or provide technology or equipment to support the production of energy from solar, wind, hydrogen and other renewable sources