This exchange-traded fund seeks investment results that correspond generally to the price and yield (before the Fund's fees and expenses) of the ISE Clean Edge Global Wind Energy Index. The index is constructed as follows:

• Companies in the index universe that are identified as providing goods and services exclusively to the wind energy industry are given an aggregate weight of 60% of the index.Those companies determined to be significant participants in the wind energy industry despite not being exclusive to such industry are given an aggregate weight of 40% of the index.This weighting is done to ensure that companies that are exclusive to the wind energy industry, which generally have smaller market capitalizations relative to their multi-industry counterparts, are adequately represented in the index.
• The index uses a modified market capitalization weighted methodology for each group of companies. The methodology organizes the companies into quintiles based upon their market capitalization. The quintiles containing larger market capitalization companies receive a higher weight than those quintiles containing small market capitalization companies.The resulting weight distribution prevents a few large companies from dominating the index while allowing smaller companies to adequately influence index performance.The companies are equally-weighted within each quintile.
• The component security must be actively engaged in some aspect of the wind energy industry such as the development or management of a wind farm, the production or distribution of electricity generated by wind power, involvement in the design, manufacture or distribution of machinery or materials designed specifically for the wind energy industry.
• Each component security must have a market capitalization of at least $100 million and meet certain investability requirements.
• The index is reconstituted and rebalanced semi-annually.