February’s column in the Pennsylvania Law Weekly / Legal Intelligencer considers the "environmental debts" that often arise in transactions or otherwise.  Managing Environmental Obligations:  Tracking "Environmental Debtors", 35 Pa. L. Weekly 196 (Feb. 28, 2012).   Some undertake obligations to clean up, to operate facilities, to indemnify, or to maintain institutional controls.  Others receive rights to enforce those obligations.  Who owes a client a debt?  Whom does the client owe?  When should claims be accelerated?  When should they be deferred?