[Christian Science Monitor] U.S. companies from General Electric to Wal-Mart have spent the past several years announcing initiatives on everything from efficient buildings to alternative energy to leading-edge technologies to combat global warming. Now, with the economy slowing, some of those projects look iffy. In the past, companies shelved environmental initiatives when profits shrank. This time, despite some slowing in momentum, corporate America’s “green” campaign will survive, analysts predict. The reason: In a world of $80-a-barrel oil, there is a business case for saving energy.