The S&P 500 Index includes 80% of total market capitalization, so when a large majority of its members do something, it’s big news. Here's the story: 81% of the Indexes’ listed companies published corporate responsibility reports in 2015, according to the Governance & Accountability Institute, a sustainability reporting firm. This compares with only 20% reporting in 2011, when G&A began its analysis. Read more: http://bit.ly/1WGp0rL

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