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PBS News Hour
How effective are business efforts to go green?
Walmart says that 28 percent of domestic power at its stores comes from renewable sources. And 85 percent of companies in the S&P 500 are also reporting updates on sustainability in their annual reports for investors -- up from 11 percent in 2011. Paula DiPerna, special advisor to CDP, an organization that tracks environmental disclosures by companies, joins Hari Sreenivasan for more.
