Impact metrics, with the exception of Engagement and Tobacco, are based significantly on data self-reported by companies. Due to limitations in uniform reporting standards and inconsistent participation by companies, impact data coverage will vary, in some cases significantly. To evaluate the coverage level in both the portfolio and the index, a coverage % range is provided, where applicable. Coverage indicates how much of the portfolios or index is represented by that metric. For example, portfolio coverage of 72%-83% means that the impact metric represents approximately 72%-83% of the Fund portfolios holdings, depending on each Fund's composition. MSCI data is from fiscal year 2016 and applied to holdings information as of Fourth Quarter 2017.

FOSSIL FUEL RESERVES (Source: MSCI): Represents the percentage of companies with ownership of fossil fuel reserves regardless of their industries, including companies that own less than 50% of a reserves field. Evidence of owning reserves includes companies providing the exact volume of reserves, and companies making a statement about their ownership of reserves.

TOXIC EMISSIONS (Source: MSCI): This figure represents the weighted-average of total combined emissions of nitrogen oxides (NOx), sulfur oxide (Sox) and Volatile Organic Compounds (VOCs) produced by companies. Toxic emissions are the combined results of NOx, Sox and VOCs data. The average coverage range for these three metrics are 2%-6.75% for the portfolios and 2%-12% for the index.

CARBON (Source: MSCI): MSCI data reflects a company's most recently reported "Scope 1 and Scope 2 emissions" which are defined as direct emissions controlled by the reporting company (Scope 1) or indirect emissions of the reporting company generated from electricity, heating or cooling systems (Scope 2).Coverage range of the Carbon metric is 96%-99% for the portfolio and 91%-98% for the index.

TOBACCO (Source: Global Industry Classification Standard-GICS): Reflects the percentage of holdings in companies related to tobacco production, expressed also as the percentage of tobacco exposure. The Calvert Principles for Responsible Investment generally preclude investment in issuers that manufacture tobacco products.

ENGAGEMENT (Source: Calvert and Institutional Shareholder Services (ISS)): Derived from quarterly NPX filings (SEC-recorded proxy votes), 01/01/2017-12/31/2017. Engagement reflects the percentage of votes that are in favor of a proposed resolution on the subject of "Climate Change" and "Gender Pay Equality" as categorized by ISS. Votes of the following Calvert Funds are represented: US Large-Cap Core Responsible Index Fund , Calvert US Large-Cap Growth Responsible Index Fund, Calvert US Mid-Cap Core Responsible Index Fund, Calvert International Responsible Index Fund and Calvert US Large Cap Value Responsible Index Fund.