Eighty-six percent of companies on the Standard and Poor's 100 Index have corporate sustainability websites, compared to 58 percent in 2005, according to the "2008 S&P 100 Sustainability Report Comparison" from the Sustainable Investment Research Analyst Network (SIRAN), a working group of the Social Investment Forum.

Roughly half produced a sustainability report last year, 26 percent higher than in 2005, when 39 companies issued reports.

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