Siemens and McGraw-Hill Construction released a report October 31 finding that sustainability is becoming part of standard operations for more companies in the United States. The report, 2012 Greening of Corporate America, concluded that the percentage of companies highly engaged in sustainability rose from 18 percent in 2006 to 42 percent in 2012, and 37 percent of those activities are generating revenue, while 63 percent are internal activities.