Some companies get A’s for their efforts at replacing bisphenol-A (BPA) in can linings, and others get F’s, according to a new report from a pair of environmentally oriented associations. The report from As You Sow, an environmental advocacy group, and Green Century Capital Management, which advises investors on “green” companies, dealt with replacements for BPA, the nearly ubiquitous can lining component that has been linked to cancer and other disorders. H.J. Heinz, ConAgra and Hain Celestial all got A’s for rolling out BPA-free cans, while companies including Coca-Cola, Safeway, Walmart and Del Monte got F’s for making no such efforts. Other companies received middling grades for making limited efforts.