Bloomberg: Hewlett-Packard, PepsiCo, Procter & Gamble and eight other global companies are assessing the emissions of their supply chains as part of efforts to cut greenhouse gases and inform investors of their so-called carbon footprint. Each picked as many as 50 of their suppliers to reply to questions from the Carbon Disclosure Project by March, the CDP said in an e-mailed statement. The nonprofit project coordinates environmental data requests on behalf of 315 investors with $41 …