Where to locate a new headquarters how to close a supply-chain loop how to anticipate customer demands: These are all decisions that companies must wrestle with as they respond to increasing concerns about global warming. Given the rush to be environmentally friendly where do companies turn for dependable information and good advice? Wharton faculty and other experts say companies have to rely on a combination of internal and external resources as they try not only to manage the risks of climate change but also to gain a competitive edge.